[release/8.0] Don't assume that FK of skip navigation is non-null #32925
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Port of #32920
Fixes #32732
Description
With some combination of skip and normal navigations, we execute the SQL Server delete convention for skip navigations that do not yet have an associated FK.
Customer impact
Null reference exception from model building.
How found
Customer reported on 8.
Regression
Yes, from 7.
Testing
Tests added.
Risk
Low. Quirked.