5195: Fix upload wizard crash on tapping target icon (#5306)

* LocationPickerActivity: fix crash on setting location for pictures with no EXIF location

* strings.xml: remove extra string introduced

* optimise constants

* LocationPickerActivity: request for permission only on tapping target icon

* remove newline

* handle location permissions using LocationPermissionsHelper

* add null check to prevent crash

Author: RitikaPahwa4444

app/src/main/java/fr/free/nrw/commons/LocationPicker/LocationPickerActivity.java

@@ -483,13 +483,16 @@ public void onLocationPermissionDenied(String toastMessage) {
             @Override
             public void onLocationPermissionGranted() {
                 fr.free.nrw.commons.location.LatLng currLocation = locationManager.getLastLocation();
-                final CameraPosition position;
-                position = new CameraPosition.Builder()
-                    .target(new com.mapbox.mapboxsdk.geometry.LatLng(currLocation.getLatitude(), currLocation.getLongitude(), 0)) // Sets the new camera position
-                    .zoom(mapboxMap.getCameraPosition().zoom) // Same zoom level
-                    .build();
-
-                mapboxMap.animateCamera(CameraUpdateFactory.newCameraPosition(position), 1000);
+                if (currLocation != null) {
+                    final CameraPosition position;
+                    position = new CameraPosition.Builder()
+                        .target(new com.mapbox.mapboxsdk.geometry.LatLng(currLocation.getLatitude(),
+                            currLocation.getLongitude(), 0)) // Sets the new camera position
+                        .zoom(mapboxMap.getCameraPosition().zoom) // Same zoom level
+                        .build();
+
+                    mapboxMap.animateCamera(CameraUpdateFactory.newCameraPosition(position), 1000);
+                }
             }
         });
         locationPermissionsHelper.handleLocationPermissions(locationAccessDialog, locationOffDialog);