Allow fallback parser to skip comments in unknown IF_DATA blocks

[AkhilTThomas]

The fallback IF_DATA parser crashes with "/begin in block ... is not followed by a valid tag" when it encounters block comments (/* ... */) or line comments (// ...) inside an IF_DATA block.

This used to work at least in the a2ltool version 2.4.0.

The PR fixes it enables back the parsing of comments between unknown tagged struct block.

[DanielT]

Good catch! Thanks for the fix.
I also appreciate that you added a test for the problem.

[AkhilTThomas]

Good catch! Thanks for the fix.
I also appreciate that you added a test for the problem.

How often is the a2ltool released?
I'd appreciate if there is a new release using these changes 😃

[DanielT]

How often is the a2ltool released?

Whenever there are features / fixes to release, and I find time to do so :-)
I almost did it yesterday, since there is already a fix from louiscaron that I also want to release, but then other stuff came up.
So the next release will be soon(ish).