Fixes check for no treating physician and not mandate for Domicialiary Care

[rithviknishad]

Proposed Changes

• Fixes issue with how None treating physician was checked for throwing required validation error
• Skip treating physician being required for Domicialiary Care patients

Associated Issue

• Treating Doctor field should not be mandatory for Domiciliary Care patients  care_fe#8304
• Fixes AttributeError: 'NoneType' object has no attribute 'user_type' #2381

Architecture changes

• Remove this section if not used

Merge Checklist

• Tests added/fixed
• 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

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: care/facility/api/serializers/patient_consultation.py

Function	Unhandled Issue
validate	AttributeError: 'NoneType' object has no attribute 'user_type' /api/v1... Event Count: 7

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[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 63.88%. Comparing base (a4e2f8b) to head (96e8417).

Files	Patch %	Lines
...e/facility/api/serializers/patient_consultation.py	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2382      +/-   ##
===========================================
+ Coverage    63.86%   63.88%   +0.01%     
===========================================
  Files          239      239              
  Lines        13439    13440       +1     
  Branches      1914     1914              
===========================================
+ Hits          8583     8586       +3     
+ Misses        4508     4507       -1     
+ Partials       348      347       -1     

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[nihal467]

LGTM