Samuel Attard 8b523cf88a fix: ensure modeL_ exists before calling delegate methods (#20111) ...

This is a speculative fix for a crash we are seeing in `menuDidClose`.  We
can't repro the crash but the traces have it happening in this method
and just by reading through the impl the only part that jumps out as
Might Crash is this `model_` call.  Other methods in the menu controller
check `model_` before using it so it probably makes sense to do that here
as well.

2019-09-04 13:42:23 -07:00

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