Fixed render crash when using inline include with a string template

[wisskid]

Fixes #639

[wisskid]

@AnrDaemon have a look please?

[AnrDaemon]

Had one. There's at least two issues with this PR.

1. It evaluates incorrectly (see modified unit test in Added regression test for smarty-php/smarty#639 #652 ).
2. It does not cover the regression reported (see specific regression test in the same PR).

[wisskid]

so... is the fuss about the newline or about the fatal error?

[AnrDaemon]

Now it is about different rendering result before and after the fix.

There's no more crashes as far as I can see.

[wisskid]

OK, but In my experience there was always a fatal error when rendering a string template inline.
I see the extra newline in the output, but wouldn't that be a separate, somewhat less important issue? Also: why would one render a string template as inline?

[AnrDaemon]

string: source was used to easily demonstrate the issue using as few extra files as possible.
In real world, it was indeed an external file, but I made sure the results are exactly same.

[AnrDaemon]

To clarify: I've never had crashes with string:… inline alone.