fix: fix behavior of AuthorizationResultBasedEntityAssociationLoader when field value is empty string

[wschurman]

Why

The bug is that if the column in the current entity that contains the referenced entity's id is an empty string, the load method would erroneously return null. This correct the behavior to correctly try to load the entity by ID, which correctly fails since the field is invalid.

How

Fix check.

Test Plan

Add new test.

[wschurman]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• fix: correctness of TSMockitoExtensions isEqualWithEntityAware for SerializableKeyMaps of different length #614
• fix: fix possible composite key collision in StubDatabaseAdapter test utility #613
• chore: update comment for IEntityMetricsAdapter for implementors #612
• fix: pick method crash when object has hasOwnProperty key #611
• fix: fix behavior of AuthorizationResultBasedEntityAssociationLoader when field value is empty string #610 👈 (View in Graphite)
• feat: support numeric enums in StrictEnumField #609
• feat: validate GenericRedisCacheContext #608
• fix: skip when AllowIfAllSubRulesAllowPrivacyPolicyRule is empty #607
• fix: correct cycle guard behavior for deletion #606
• fix: handle potential infinite recursion for canViewerDeleteAsync #605
• feat: clean up transactional dataloader at transaction end #604
• fix: correct negative caching behavior in GenericSecondaryEntityCache #603
• fix: update cache key generation for secondary caches #602
• fix!: replace makeKeyFn with delimiter to strengthen guarantee of proper escaping #601
• fix: prevent collision in companion when entities share same name or same table name #600
• chore: remove unnecessary ViewerScopedEntityMutatorFactory #599
• main

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (6e3a24e) to head (99daddc).

Additional details and impacted files

@@                                  Coverage Diff                                  @@
##           05-14-feat_support_numeric_enums_in_strictenumfield      #610   +/-   ##
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  Coverage                                               100.00%   100.00%           
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  Files                                                      109       109           
  Lines                                                    17738     17738           
  Branches                                                  1539      1539           
=====================================================================================
  Hits                                                     17738     17738           

Flag	Coverage Δ
integration	28.62% <0.00%> (ø)
unittest	94.53% <100.00%> (ø)

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