django__django-15382

filter on exists-subquery with empty queryset removes whole WHERE block

Verdict: the issue text repeats lines of the gold patch (Tier C).

Since Exists encapsulate its negation logic (see __invert__) it should catch EmptyResultSet when raised by its super() call in as_sql and return an always true predicate (e.g. 1=1).

4 of 4 added patch lines appear in the issue or discussion.

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