[Wikidata-bugs] [Maniphest] [Edited] T189842: Undefined index error in CachingResultsBuilder when checking constraints on empty entity

[Lucas_Werkmeister_WMDE]

Lucas_Werkmeister_WMDE updated the task description. (Show Details)

CHANGES TO TASK DESCRIPTION

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Not sure what the best solution for this will be… probably some kind of `NullContextCursor` (only entity ID, no statement etc.) that we can plug into the `NullResult` we already have from T178160?

#patch-for-review (two chains):
- quick fix:
- [workaround](https://gerrit.wikimedia.org/r/420010)
- proper fix:
- [refactoring](https://gerrit.wikimedia.org/r/420319)
- [add `EntityContextCursor`](https://gerrit.wikimedia.org/r/420320)
- [actual fix](https://gerrit.wikimedia.org/r/420321)

TASK DETAIL

https://phabricator.wikimedia.org/T189842

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To: Lucas_Werkmeister_WMDE
Cc: gerritbot, Lucas_Werkmeister_WMDE, Aklapper, Reedy, Versusxo, Majesticalreaper22, Ahmed123, Tamgue, Giuliamocci, Adrian1985, Cpaulf30, Lahi, Gq86, Baloch007, Darkminds3113, Lordiis, GoranSMilovanovic, Adik2382, Th3d3v1ls, Ramalepe, Liugev6, QZanden, LawExplorer, Lewizho99, Maathavan, Agabi10, Wikidata-bugs, aude, Lydia_Pintscher, Mbch331, Jay8g, Krenair

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