Fix parsing of nested CDATA in PTD items

[isc-pbarton]

Fixes #667

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 85.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 41.83%. Comparing base (76221f9) to head (13b474d).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
cls/SourceControl/Git/Production.cls	85.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #671      +/-   ##
==========================================
+ Coverage   41.81%   41.83%   +0.02%     
==========================================
  Files          23       23              
  Lines        3030     3033       +3     
==========================================
+ Hits         1267     1269       +2     
- Misses       1763     1764       +1     

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