fix creating notifications if shifting_approving_facility is not available

[sainak]

Proposed Changes

• check shifting_approving_facility before creating a notification, shifting_approving_facility is optional in peacetime mode

Associated Issue

• fixes Facility.DoesNotExist: Facility matching query does not exist. #1465

Architecture changes

• Remove this section if not used

Merge Checklist

• Tests added/fixed
• Update docs in /docs
• Linting Complete
• Any other necessary step

Only PR's with test cases included and passing lint and test pipelines will be reviewed

@coronasafe/care-backend-maintainers @coronasafe/care-backend-admins

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.86%. Comparing base (fd2e954) to head (a1bb8c1).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2372   +/-   ##
========================================
  Coverage    63.86%   63.86%           
========================================
  Files          239      239           
  Lines        13439    13439           
  Branches      1914     1914           
========================================
  Hits          8583     8583           
  Misses        4508     4508           
  Partials       348      348           

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