Fix bed assignment validation for admission

[Ashesh3]

Fixes ohcnetwork/care_fe#7340

This pull request fixes the bed assignment validation for admission. Previously, if a patient did not have a bed assigned and the suggestion was 'A', an error would occur. This PR ensures that the error is raised only when the patient does not have a bed assigned and the suggestion is 'A'.

[nihal467]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.95%. Comparing base (aba0849) to head (89f9749).

❗ Current head 89f9749 differs from pull request most recent head d37985a. Consider uploading reports for the commit d37985a to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           staging    #1945   +/-   ##
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  Coverage    61.95%   61.95%           
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  Files          221      221           
  Lines        12171    12171           
  Branches      1736     1736           
========================================
  Hits          7540     7540           
  Misses        4325     4325           
  Partials       306      306           

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