Fix an issue with an instant crash for invalid xml in TiGLCreator

[joergbrech]

Description

Fixes #994. If you add an xml node without content, TIGL crashes. The reason is that in the generated code, only existence of tixi elements is checked, not if the tixi element has any text contents.

To fix this, we need to fix the check in the generated code and regenerate all the files. Therefore this PR depends on DLR-SC/cpacs_tigl_gen#9 to be merged first. The changes in this PR are just regenerated src files with the updated cpacs_gen version.

To Do:

• Make sure that the submodule points to the latest commit of master once use TixiCheckElementHasTextContent for mandatory scalar fields cpacs_tigl_gen#9 is merged.

How Has This Been Tested?

Since this is a TiGLCreator issue it was only tested manually with the TiGLCreator. The test file in the issue description logs an error, but the geometry can be generated and TiGLCreator does not crash anymore.

Screenshots, that help to understand the changes(if applicable):

Checklist:

Task	Finished	Reviewer Approved
At least one test for the new functionality was added.	yes does not apply	OK
New classes have been added to the Python interface.	yes does not apply	OK
The code is properly documented with doxygen docstrings	yes does not apply	OK
Changes are documented at the top of ChangeLog.md	yes does not apply	OK

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.58%. Comparing base (09375d1) to head (9e36890).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1322   +/-   ##
=======================================
  Coverage   72.58%   72.58%           
=======================================
  Files         316      316           
  Lines       27750    27750           
=======================================
  Hits        20141    20141           
  Misses       7609     7609           

Flag	Coverage Δ
unittests	72.58% <ø> (ø)

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[svengoldberg]

Looks good to me!