FIX: grpc materials fixed

[svandenb-dev]

This PR is resolving internal material properties failure. These errors were harmless but could lead to confusion. This was also pointed by users and adressing issue #1963.
grpc material has now safe guards with:

• checking dielectric model are defined before accessing parameters
• all material properties are present in material definition before accessing

closes #1963

[codecov-commenter]

Codecov Report

❌ Patch coverage is 91.74312% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.65%. Comparing base (5cbae21) to head (6194dde).
⚠️ Report is 61 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1966      +/-   ##
==========================================
+ Coverage   70.20%   70.65%   +0.44%     
==========================================
  Files         261      263       +2     
  Lines       42416    43031     +615     
==========================================
+ Hits        29779    30402     +623     
+ Misses      12637    12629       -8     

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[SMoraisAnsys]

Thanks for the changes, I added minor comments.
Could you also clarify why you are returning None in some cases and 0 in others? Would it make sense to align the "strategy" to always return None if no value /model was defined ?

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

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🟢 Metrics 0 duplication

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[svandenb-dev]

Thanks for the changes, I added minor comments. Could you also clarify why you are returning None in some cases and 0 in others? Would it make sense to align the "strategy" to always return None if no value /model was defined ?

Returning 0.0 is made to preserve DotNet and Config file compatibility with providing default value. Few properties are returning None since they are optional, I mean by optional not necessarily defined. Like dc_conductivity assumes dielectric model is defined prio accessing this attribute.

Done