FIX: Import CAD with None value in control file

[Samuelopez-ansys]

Description

If the control file (xml_path) is None, then Path raises an exception. Now it is checking if the value is None.

Issue linked

Please mention the issue number or describe the problem this pull request addresses.

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved by the PR if any.
• I have agreed with the Contributor License Agreement (CLA).

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.11%. Comparing base (ebd0ebb) to head (5caa475).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6436      +/-   ##
==========================================
- Coverage   85.12%   85.11%   -0.01%     
==========================================
  Files         176      176              
  Lines       66944    66944              
==========================================
- Hits        56983    56982       -1     
- Misses       9961     9962       +1     

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[SMoraisAnsys]

LGTM