Prevent corrupted pptx compilation

[igavriil]

When a translation contains less parts (separate by tags) the remaining parts of the source, that are present in the source file, must be removed from the xml.

Until now the removal was removing the text element by itself (<a:t>) leaving other elements intact.

This resulted in the presence of some <a:r> blocks that had not content in them and should be the reason why the pptx files is considered corrupted.

With this commit instead of removeing the <a:t> element only we instead remove the surround <a:r> block all together that will lead to compilation of non corrupted files.

Problem and/or solution

How to test

Reviewer checklist

Code:

• Change is covered by unit-tests
• Code is well documented, well styled and is following best practices
• Performance issues have been taken under consideration
• Errors and other edge-cases are handled properly

PR:

• Problem and/or solution are well-explained
• Commits have been squashed so that each one has a clear purpose
• Commits have a proper commit message according to TEM