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Fix TypeError: Cannot read properties of null (reading 'trim') in UserProfile component

🐞 Bug Report

Summary: UserProfile component crashes with TypeError: Cannot read properties of null (reading 'trim') when contribution items contain null or undefined values.

Steps to Reproduce:

  1. Run the application.

  2. Navigate to the Profile tab.

  3. Ensure the API returns contribution items where fields like title, description, release_rights, or language are null.

  4. Observe that the page crashes and no profile data is displayed.

Expected Behavior: The UserProfile component should handle null or undefined values safely, and valid API data should render without crashing.

Actual Behavior: The component attempts to call .trim() on null or undefined, leading to:

TypeError: Cannot read properties of null (reading 'trim')