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When a partitioned table has a primary key, trying to find the corresponding not-null constraint for that column would come up empty, causing code that's trying to check said not-null constraint to crash. Fix by only running the check when the not-null constraint exists. Reported-by: Alexander Lakhin <exclusion@gmail.com> Discussion: https://postgr.es/m/d57b4a69-7394-3146-5976-9a1ef27e7972@gmail.com