Fixed NPE while rapidly switching between list and map, during data loading.

Author: psh

app/src/main/java/fr/free/nrw/commons/nearby/NearbyListFragment.java

@@ -60,7 +60,7 @@ public void onViewCreated(View view, Bundle savedInstanceState) {
 
         Bundle bundle = this.getArguments();
         if (bundle != null) {
-            String gsonPlaceList = bundle.getString("PlaceList");
+            String gsonPlaceList = bundle.getString("PlaceList", "[]");
             placeList = gson.fromJson(gsonPlaceList, LIST_TYPE);
 
             String gsonLatLng = bundle.getString("CurLatLng");