[8.x] Fix issue with polymorphic morphMaps with literal 0 #35364
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Background
Ran into project where
During a legacy upgrade I noticed failures after completing the 5.8.x upgrade. At first I tracked it to this - #27175, which then resulted in changing my
morphTo
parameters tonull, null, null, 'id'
so ownerKey would be set properly.It still failed. It appeared that getting a 0 zero value back from
entity_type
(entity morph) was passing theempty
check in the wrong way no longer resulting in getting the morphed instance back.The comment above the code change even says "if value is null", so probably just a mistake.
Test
Never wrote a test for the DB area before. Hope it works out. Open for feedback.