Make validate_pydantic_parameter return True when no errors are present

Summary of Changes

The result of validate_pydantic_parameter is passed back to Vuetify, which expects a true value if no errors are present. Returning None is causing the browser to spam console warnings when validation is successful.

Checklist

• The MR has a clear and concise title
• Code is self-documented and follows style guidelines.
• Automated tests are written and pass successfully.
• Regression tests (e.g. manually triggered system tests, manual GUI/tool tests, ...) are performed to make sure the MR does not break anything (when applicable)
• Readme file is present and up-to-date.

Documentation Updates

Additional Notes

Closes #18 (closed)