Fixes 1026106 - in some cases, NSEvent seems to have been null

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Fixes 1026106 - in some cases, NSEvent seems to have been null #9405

Closed avodovnik closed 4 years ago

avodovnik commented 4 years ago

This introduces a null check, and also introduces additional debug levelchecks for others, just to make sure if we do run into this while debugging, that we are aware.

Fixes https://vsmac.dev/1026106

sandyarmstrong commented 4 years ago

@monojenkins backport release-8.4