Fix crashing the application when a user presses on the map and the G…

…oogle Play Services need to be updated or at the moment of the process of updating (react-native-maps#1469)

lib/android/src/main/java/com/airbnb/android/react/maps/AirMapView.java

@@ -720,18 +720,20 @@ public void stopMonitoringRegion() {
     @Override
     public void run() {
 
-      Projection projection = map.getProjection();
-      VisibleRegion region = (projection != null) ? projection.getVisibleRegion() : null;
-      LatLngBounds bounds = (region != null) ? region.latLngBounds : null;
-
-      if ((bounds != null) &&
-          (lastBoundsEmitted == null ||
-              LatLngBoundsUtils.BoundsAreDifferent(bounds, lastBoundsEmitted))) {
-        LatLng center = map.getCameraPosition().target;
-        lastBoundsEmitted = bounds;
-        eventDispatcher.dispatchEvent(new RegionChangeEvent(getId(), bounds, center, true));
+      if (map != null) {
+        Projection projection = map.getProjection();
+        VisibleRegion region = (projection != null) ? projection.getVisibleRegion() : null;
+        LatLngBounds bounds = (region != null) ? region.latLngBounds : null;
+
+        if ((bounds != null) &&
+            (lastBoundsEmitted == null ||
+                LatLngBoundsUtils.BoundsAreDifferent(bounds, lastBoundsEmitted))) {
+          LatLng center = map.getCameraPosition().target;
+          lastBoundsEmitted = bounds;
+          eventDispatcher.dispatchEvent(new RegionChangeEvent(getId(), bounds, center, true));
+        }
       }
-
+      
       timerHandler.postDelayed(this, 100);
     }
   };