Improve error handling

Timur Oberhuberrequested to merge
78-improve-error-handling into dev

Description

  • Prevents errors with empty input fields (profile page - training, extra work creation)
  • Fix rejecting all applications when none are unhandled

Related Issues

Checklist

  • I have added a changelog entry to reflect the significant changes I made.
Edited by Timur Oberhuber

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