Fix crash when reloading when a modal was displayed

lib/android/app/src/main/java/com/reactnativenavigation/react/ReactView.java

 
 	@Override
 	public void sendComponentStart() {
-		new EventEmitter(reactInstanceManager.getCurrentReactContext()).componentDidAppear(componentId, componentName);
+        ReactContext currentReactContext = reactInstanceManager.getCurrentReactContext();
+        if (currentReactContext != null) {
+            new EventEmitter(currentReactContext).componentDidAppear(componentId, componentName);
+        }
 	}
 
 	@Override
 	public void sendComponentStop() {
-		new EventEmitter(reactInstanceManager.getCurrentReactContext()).componentDidDisappear(componentId, componentName);
+        ReactContext currentReactContext = reactInstanceManager.getCurrentReactContext();
+        if (currentReactContext != null) {
+            new EventEmitter(currentReactContext).componentDidDisappear(componentId, componentName);
+        }
 	}
 
     @Override
 	public void sendOnNavigationButtonPressed(String buttonId) {
-		new EventEmitter(reactInstanceManager.getCurrentReactContext()).emitOnNavigationButtonPressed(componentId, buttonId);
+        ReactContext currentReactContext = reactInstanceManager.getCurrentReactContext();
+        if (currentReactContext != null) {
+            new EventEmitter(currentReactContext).emitOnNavigationButtonPressed(componentId, buttonId);
+        }
 	}
 
     @Override

lib/android/app/src/main/java/com/reactnativenavigation/viewcontrollers/Navigator.java

 import com.reactnativenavigation.utils.CommandListener;
 import com.reactnativenavigation.utils.CommandListenerAdapter;
 import com.reactnativenavigation.utils.CompatUtils;
-import com.reactnativenavigation.utils.NativeCommandListener;
 import com.reactnativenavigation.viewcontrollers.modal.ModalPresenter;
 import com.reactnativenavigation.viewcontrollers.modal.ModalStack;
 import com.reactnativenavigation.viewcontrollers.stack.StackController;
     }
 
     private void destroyViews() {
-        destroyRoot();
-        overlayManager.destroy();
         modalStack.dismissAllModals(new CommandListenerAdapter(), root);
+        overlayManager.destroy();
+        destroyRoot();
     }
 
     private void destroyRoot() {
         modalStack.dismissAllModals(listener, root);
     }
 
-    public void showOverlay(ViewController overlay, NativeCommandListener listener) {
+    public void showOverlay(ViewController overlay, CommandListener listener) {
         overlayManager.show(rootLayout, overlay, listener);
     }
 

lib/android/app/src/test/java/com/reactnativenavigation/viewcontrollers/NavigatorTest.java

         verify(overlayManager, times(1)).destroy();
     }
 
+    @Test
+    public void destroyViews() {
+        disableShowModalAnimation(child1);
+        uut.setRoot(parentController, new CommandListenerAdapter());
+        uut.showModal(child1, new CommandListenerAdapter());
+        uut.showOverlay(child2, new CommandListenerAdapter());
+        uut.destroy();
+        assertThat(childRegistry.size()).isZero();
+    }
+
     @Test
     public void reload_navigatorIsDestroyedOnReload() {
         uut.setRoot(parentController, new CommandListenerAdapter());