Handle deprecation of BackHandler.removeEventListener #4738
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Motivation
In RN 0.77, they deprecated BackHandler.removeEventListener. The
Modalcomponent on the 4.x branch is set up to callhideModalwhen it's mounted withvisible={false}, and becauseshowModalhas never been called, there's no existing subscription. Because of this, we fall to theelsecase which callsBackHandler.removeEventListener. Pre RN 0.77, this wasn't a problem, but because the function no longer exists, it now throws an error.This patch simply adds a null check before trying to call the
BackHandler.removeEventListener, which causes the above situation to fail gracefully.Related issue
Test plan