change file requirement for plot input tab

Xiao, Zhongcanrequested to merge
38-change-file-requirement-for-plot-input-tab into main

Summary of Changes

The SA and flux files in plotinput tab are optional. Changed the default value to 'None'.

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

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