[release/7.0] Handle entity paths with no tables in model differ #30394
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Port of #30347
Fixes #30321
Description
With TPC mapping (new feature in EF7), abstract types are not mapped to any table. This case was not being handled correctly in the model differ.
Customer impact
"Sequence contains no elements" exception when attempting to generate a migration for simple changes in abstract types. No workaround.
How found
Customer reported on 7.0.
Regression
No; bug in new feature.
Testing
Tests updated.
Risk
Low and quirked.