Fix #62474: com_event_sink crashes on certain arguments #6372
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We have to make sure that the variant is of type `VT_DISPATCH` before we access it as such.
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We have to make sure that the variant is of type
VT_DISPATCHbeforewe access it as such.
I'm not 100% sure whether the behavior is correct, but certainly it's better to let
com_event_sink()fail and to returnfalseinstead of segfaulting.