[Android] fix: Check null in order to avoid crash randomly and unexpectedly #7810
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From our app crashlytic, we saw a lot of crashes like this
Attempt to invoke virtual method 'com.reactnativenavigation.viewcontrollers.navigator.Navigator com.reactnativenavigation.NavigationActivity.getNavigator()' on a null object reference
I cannot figure out why navigator is NULL. However, we should check null before calling method in order to avoid unexpected crash. I think the React host is null in moment, and then when users click again, the host will be available