fix(GidOutput): check if material_attribute exist in is saveable

[BenPinet]

No description provided.

[github-actions]

Cpp-Linter Report ⚠️

Some files did not pass the configured checks!

clang-tidy (v21.1.8) reports: 2 concern(s)

• src/geode/io/model/gid_output.cpp:64:34: warning: [bugprone-unchecked-optional-access]

  unchecked access to optional value

     64 |                                  attribute_ids.value().at( 0 ) );
        |                                  ^~~~~~~~~~~~~

• src/geode/io/model/gid_output.cpp:81:34: warning: [bugprone-unchecked-optional-access]

  unchecked access to optional value

     81 |                                  attribute_ids.value().at( 0 ) );
        |                                  ^~~~~~~~~~~~~

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[BotellaA]

🎉 This PR is included in version 7.8.1-rc.1 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀

[BotellaA]

🎉 This PR is included in version 7.8.1 🎉

The release is available on GitHub release

Your semantic-release bot 📦🚀