fix: hasMorph/whereDoesntHaveMorph OR grouping with nullable morphs #57937
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−4
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Fixes #57887
This PR fixes an issue where whereDoesntHaveMorph('relation', '*') on a nullable morph relationship generates SQL with an ungrouped OR expression.
As a result, the whereDoesntHaveMorph('relation', '*') constraint does not compose correctly with other query constraints and is not commutative, leading to unexpected results when combined with additional where clauses.