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Don't try to collapse zero events with a group #4131
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Fixes element-hq/element-web#12423 When events are redacted they fail to make it into the Grouper because the `shouldAddEvent` check blocks them from entering. However, the grouper expects that when `getTiles()` is called that there's events to group and dutifully grabs some context from the array. Because JavaScript is the least helpful language, `myArray[-1]` returns `undefined` or `null` and thus you get `cannot read 'sender' of undefined`. Regressed in #4059
turt2live
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Feb 25, 2020
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Fixes element-hq/element-web#12423
When events are redacted they fail to make it into the Grouper because the
shouldAddEventcheck blocks them from entering. However, the grouper expects that whengetTiles()is called that there's events to group and dutifully grabs some context from the array. Because JavaScript is the least helpful language,myArray[-1]returnsundefinedornulland thus you getcannot read 'sender' of undefined.Regressed in #4059