Fix NullPointer when clicking on image in MediaDetailFragment (#3730)… (#3739)

Author: ashishkumar468

app/src/main/java/fr/free/nrw/commons/media/MediaDetailFragment.java

@@ -209,10 +209,12 @@ && getParentFragment() instanceof MediaDetailPagerFragment) {
 
     @OnClick(R.id.mediaDetailImageViewSpacer)
     public void launchZoomActivity(View view) {
-        Context ctx = view.getContext();
-        ctx.startActivity(
-                new Intent(ctx,ZoomableActivity.class).setData(Uri.parse(media.getImageUrl()))
-        );
+        if (media.getImageUrl() != null) {
+            Context ctx = view.getContext();
+            ctx.startActivity(
+                new Intent(ctx, ZoomableActivity.class).setData(Uri.parse(media.getImageUrl()))
+            );
+        }
     }
 
     @Override

app/src/main/java/fr/free/nrw/commons/nearby/fragments/NearbyParentFragment.java

@@ -1120,9 +1120,7 @@ public void filterMarkersByLabels(List<Label> selectedLabels,
         boolean filterForPlaceState,
         boolean filterForAllNoneType) {
 
-        // Remove the previous markers before updating them
         hideAllMarkers();
-
         for (MarkerPlaceGroup markerPlaceGroup : NearbyController.markerLabelList) {
             Place place = markerPlaceGroup.getPlace();
 
@@ -1217,7 +1215,7 @@ public void updateMarker(boolean isBookmarked, Place place, @Nullable fr.free.nr
      * since grey icon may lead the users to believe that it is disabled or prohibited contribution
      */
 
-    private void hideAllMArkers() {
+    private void hideAllMarkers() {
         VectorDrawableCompat vectorDrawable;
         vectorDrawable = VectorDrawableCompat.create(
                 getContext().getResources(), R.drawable.ic_custom_greyed_out_marker, getContext().getTheme());