Add nil check to privacy manifest generation (#44400)

Summary:
After upgrading my app from React Native 0.74.0 to 0.74.1, iOS builds were failing due to the privacy manifest ruby script failing due to what seemed to be a missing nil check.

```
[Privacy Manifest Aggregation] Appending aggregated reasons to existing PrivacyInfo.xcprivacy file.
[Privacy Manifest Aggregation] Reading .xcprivacy files to aggregate all used Required Reason APIs.
[!] An error occurred while processing the post-install hook of the Podfile.

no implicit conversion of nil into Array

node_modules/react-native/scripts/cocoapods/privacy_manifest_utils.rb:115:in `+'
node_modules/react-native/scripts/cocoapods/privacy_manifest_utils.rb:115:in `block (5 levels) in get_used_required_reason_apis'
node_modules/react-native/scripts/cocoapods/privacy_manifest_utils.rb:111:in `each'
node_modules/react-native/scripts/cocoapods/privacy_manifest_utils.rb:111:in `block (4 levels) in get_used_required_reason_apis'
node_modules/react-native/scripts/cocoapods/privacy_manifest_utils.rb:106:in `each'
node_modules/react-native/scripts/cocoapods/privacy_manifest_utils.rb:106:in `block (3 levels) in get_used_required_reason_apis'
node_modules/react-native/scripts/cocoapods/privacy_manifest_utils.rb:105:in `each'
node_modules/react-native/scripts/cocoapods/privacy_manifest_utils.rb:105:in `block (2 levels) in get_used_required_reason_apis'
node_modules/react-native/scripts/cocoapods/privacy_manifest_utils.rb:104:in `each'
node_modules/react-native/scripts/cocoapods/privacy_manifest_utils.rb:104:in `block in get_used_required_reason_apis'
node_modules/react-native/scripts/cocoapods/privacy_manifest_utils.rb:102:in `each'
node_modules/react-native/scripts/cocoapods/privacy_manifest_utils.rb:102:in `get_used_required_reason_apis'
node_modules/react-native/scripts/cocoapods/privacy_manifest_utils.rb:18:in `add_aggregated_privacy_manifest'
node_modules/react-native/scripts/react_native_pods.rb:301:in `react_native_post_install'
ios/Podfile:38:in `block (3 levels) in from_ruby'
vendor/bundle/ruby/3.3.0/gems/cocoapods-core-1.15.2/lib/cocoapods-core/podfile.rb:196:in `post_install!'
vendor/bundle/ruby/3.3.0/gems/cocoapods-1.15.2/lib/cocoapods/installer.rb:1013:in `run_podfile_post_install_hook'
vendor/bundle/ruby/3.3.0/gems/cocoapods-pod-sign-1.3.0/lib/cocoapods-pod-sign/pod_installer.rb:45:in `run_podfile_post_install_hook'
vendor/bundle/ruby/3.3.0/gems/cocoapods-1.15.2/lib/cocoapods/installer.rb:1001:in `block in run_podfile_post_install_hooks'
vendor/bundle/ruby/3.3.0/gems/cocoapods-1.15.2/lib/cocoapods/user_interface.rb:149:in `message'
vendor/bundle/ruby/3.3.0/gems/cocoapods-1.15.2/lib/cocoapods/installer.rb:1000:in `run_podfile_post_install_hooks'
vendor/bundle/ruby/3.3.0/gems/cocoapods-1.15.2/lib/cocoapods/installer.rb:337:in `block (2 levels) in create_and_save_projects'
vendor/bundle/ruby/3.3.0/gems/cocoapods-1.15.2/lib/cocoapods/installer/xcode/pods_project_generator/pods_project_writer.rb:61:in `write!'
vendor/bundle/ruby/3.3.0/gems/cocoapods-1.15.2/lib/cocoapods/installer.rb:336:in `block in create_and_save_projects'
vendor/bundle/ruby/3.3.0/gems/cocoapods-1.15.2/lib/cocoapods/user_interface.rb:64:in `section'
vendor/bundle/ruby/3.3.0/gems/cocoapods-1.15.2/lib/cocoapods/installer.rb:315:in `create_and_save_projects'
vendor/bundle/ruby/3.3.0/gems/cocoapods-1.15.2/lib/cocoapods/installer.rb:307:in `generate_pods_project'
vendor/bundle/ruby/3.3.0/gems/cocoapods-1.15.2/lib/cocoapods/installer.rb:183:in `integrate'
vendor/bundle/ruby/3.3.0/gems/cocoapods-1.15.2/lib/cocoapods/installer.rb:170:in `install!'
vendor/bundle/ruby/3.3.0/gems/cocoapods-1.15.2/lib/cocoapods/command/update.rb:63:in `run'
vendor/bundle/ruby/3.3.0/gems/claide-1.1.0/lib/claide/command.rb:334:in `run'
vendor/bundle/ruby/3.3.0/gems/cocoapods-1.15.2/lib/cocoapods/command.rb:52:in `run'
vendor/bundle/ruby/3.3.0/gems/cocoapods-1.15.2/bin/pod:55:in `<top (required)>'
vendor/bundle/ruby/3.3.0/bin/pod:25:in `load'
vendor/bundle/ruby/3.3.0/bin/pod:25:in `<top (required)>'
/Users/swrobel/.gem/ruby/3.3.1/gems/bundler-2.5.9/lib/bundler/cli/exec.rb:58:in `load'
/Users/swrobel/.gem/ruby/3.3.1/gems/bundler-2.5.9/lib/bundler/cli/exec.rb:58:in `kernel_load'
/Users/swrobel/.gem/ruby/3.3.1/gems/bundler-2.5.9/lib/bundler/cli/exec.rb:23:in `run'
/Users/swrobel/.gem/ruby/3.3.1/gems/bundler-2.5.9/lib/bundler/cli.rb:451:in `exec'
/Users/swrobel/.gem/ruby/3.3.1/gems/bundler-2.5.9/lib/bundler/vendor/thor/lib/thor/command.rb:28:in `run'
/Users/swrobel/.gem/ruby/3.3.1/gems/bundler-2.5.9/lib/bundler/vendor/thor/lib/thor/invocation.rb:127:in `invoke_command'
/Users/swrobel/.gem/ruby/3.3.1/gems/bundler-2.5.9/lib/bundler/vendor/thor/lib/thor.rb:527:in `dispatch'
/Users/swrobel/.gem/ruby/3.3.1/gems/bundler-2.5.9/lib/bundler/cli.rb:34:in `dispatch'
/Users/swrobel/.gem/ruby/3.3.1/gems/bundler-2.5.9/lib/bundler/vendor/thor/lib/thor/base.rb:584:in `start'
/Users/swrobel/.gem/ruby/3.3.1/gems/bundler-2.5.9/lib/bundler/cli.rb:28:in `start'
/Users/swrobel/.gem/ruby/3.3.1/gems/bundler-2.5.9/exe/bundle:28:in `block in <top (required)>'
/Users/swrobel/.gem/ruby/3.3.1/gems/bundler-2.5.9/lib/bundler/friendly_errors.rb:117:in `with_friendly_errors'
/Users/swrobel/.gem/ruby/3.3.1/gems/bundler-2.5.9/exe/bundle:20:in `<top (required)>'
/Users/swrobel/.gem/ruby/3.3.1/bin/bundle:25:in `load'
/Users/swrobel/.gem/ruby/3.3.1/bin/bundle:25:in `<main>'
```

Adding some good old `puts` debugging to this file indicated that the problem was that an invalid manifest file was being generated for react-native-image-crop-picker, which I don't understand, because it [doesn't currently have a Privacy Manifest](ivpusic/react-native-image-crop-picker#2040).

```xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
        <key>NSPrivacyTracking</key>
        <false/>
        <key>NSPrivacyTrackingDomains</key>
        <array/>
        <key>NSPrivacyCollectedDataTypes</key>
        <array/>
        <key>NSPrivacyAccessedAPITypes</key>
        <array>
                <dict/>
        </array>
</dict>
</plist>
```

It seems there may be some upstream issue in whatever tool generates these missing privacy manifests, but that seemed beyond the scope of a simple nil check.

## Changelog:

[iOS] [FIXED] - Privacy Manifest aggregation failing due to missing nil check

Pull Request resolved: #44400

Test Plan: Build completes successfully after making this change.

Reviewed By: cipolleschi

Differential Revision: D56921303

Pulled By: philIip

fbshipit-source-id: 1b6b10b05d403bf71f78f5b80543a2d82f043e23

Author: swrobel

packages/react-native/scripts/cocoapods/privacy_manifest_utils.rb

@@ -106,10 +106,11 @@ def self.get_used_required_reason_apis(installer)
                     content = Xcodeproj::Plist.read_from_path(file_path)
                     accessed_api_types = content["NSPrivacyAccessedAPITypes"]
                     accessed_api_types.each do |accessed_api|
-                    api_type = accessed_api["NSPrivacyAccessedAPIType"]
-                    reasons = accessed_api["NSPrivacyAccessedAPITypeReasons"]
-                    used_apis[api_type] ||= []
-                    used_apis[api_type] += reasons
+                      api_type = accessed_api["NSPrivacyAccessedAPIType"]
+                      reasons = accessed_api["NSPrivacyAccessedAPITypeReasons"]
+                      next unless api_type
+                      used_apis[api_type] ||= []
+                      used_apis[api_type] += reasons
                     end
                 end
                 end