Allow empty alt text for decorative images

[axlewin]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 40.26%. Comparing base (74f5829) to head (c87e633).

Files with missing lines	Patch %	Lines
...java/uk/ac/cam/cl/dtg/isaac/dos/content/Media.java	0.00%	3 Missing ⚠️
...ava/uk/ac/cam/cl/dtg/segue/etl/ContentIndexer.java	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #800      +/-   ##
==========================================
- Coverage   40.27%   40.26%   -0.01%     
==========================================
  Files         547      547              
  Lines       23806    23810       +4     
  Branches     2896     2897       +1     
==========================================
  Hits         9587     9587              
- Misses      13317    13321       +4     
  Partials      902      902              

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