Added a way to handle filtering admitted but no bed assigned

[yaswanthsaivendra]

Proposed Changes

• updated the PatientFilterSet to handle the None option
• made the necessary change in frontend and created an PR for the same.

Associated Issue

• Fixes Patient filter: Add None option for Last admitted to Bed filter to filter patients that are admitted but has no bed assigned #1184

Architecture changes

@coronasafe/code-reviewers

Merge Checklist

• Tests added/fixed
• Update docs in /docs
• Linting Complete

[codecov-commenter]

Codecov Report

Patch coverage: 11.11% and project coverage change: -0.05 ⚠️

Comparison is base (7d14e41) 56.71% compared to head (f201c9b) 56.67%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1318      +/-   ##
==========================================
- Coverage   56.71%   56.67%   -0.05%     
==========================================
  Files         199      199              
  Lines        9905     9914       +9     
  Branches     1654     1656       +2     
==========================================
+ Hits         5618     5619       +1     
- Misses       4232     4240       +8     
  Partials       55       55              

Impacted Files	Coverage Δ
care/facility/api/viewsets/patient.py	50.90% <11.11%> (-1.34%)	⬇️

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[gigincg]

cc: @yaswanthsaivendra

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[yaswanthsaivendra]

@vigneshhari @sainak @rithviknishad Added tests , Please Review!!

[nihal467]

LGTM, @vigneshhari can you review it, don't merge it this week

[nihal467]

@vigneshhari can you review and merge it, we are planning to close it this week