[6.0.1] Avoid NRE in ForeignKeyAttributeConvention #26520
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AndriySvyryd
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Fixes #26436
Description
An exception is thrown when configuring a foreign key on the principal side of the foreign key configured by data annotations.
Customer impact
There aren't simple workarounds other than removing the attribute, because the exception is thrown during a convention invocation.
How found
Customer report on RC2.
Regression
Yes, from 5.0, introduced in #25211.
Testing
Test for this scenario added in the PR.
Risk
Low; the fix is adding a
nullcheck that existed previously. Not adding a quirk mode as that would just result in an exception being thrown.