Fix missing_non_null_constraint
when there are no STI children for STI-like parent
#139
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When the STI-like parent model has no children, all the
next
branches in thedetect
method pass (specificallynext if !concrete_models.all? { |model| non_null_needed?(model, column) }
) andMissingNonNullConstraint
erroneously adds offenses for the column. See a test case for the example.