Remove unnecessary disposable container.

Author: dbrant

app/src/main/java/fr/free/nrw/commons/contributions/ContributionsFragment.java

@@ -62,7 +62,6 @@
 import io.reactivex.Observable;
 import io.reactivex.android.schedulers.AndroidSchedulers;
 import io.reactivex.disposables.CompositeDisposable;
-import io.reactivex.disposables.Disposable;
 import io.reactivex.schedulers.Schedulers;
 import timber.log.Timber;
 
@@ -101,7 +100,6 @@ public class ContributionsFragment
     @BindView(R.id.card_view_nearby) public NearbyNotificationCardView nearbyNotificationCardView;
     @BindView(R.id.campaigns_view) CampaignView campaignView;
 
-    private Disposable placesDisposable;
     private LatLng curLatLng;
 
     private boolean firstLocationUpdate = true;
@@ -603,15 +601,15 @@ private void displayYouWontSeeNearbyMessage() {
     private void updateClosestNearbyCardViewInfo() {
         curLatLng = locationManager.getLastLocation();
 
-        placesDisposable = Observable.fromCallable(() -> nearbyController
+        compositeDisposable.add(Observable.fromCallable(() -> nearbyController
                 .loadAttractionsFromLocation(curLatLng, curLatLng, true, false)) // thanks to boolean, it will only return closest result
                 .subscribeOn(Schedulers.io())
                 .observeOn(AndroidSchedulers.mainThread())
                 .subscribe(this::updateNearbyNotification,
                         throwable -> {
                             Timber.d(throwable);
                             updateNearbyNotification(null);
-                        });
+                        }));
     }
 
     private void updateNearbyNotification(@Nullable NearbyController.NearbyPlacesInfo nearbyPlacesInfo) {
@@ -648,10 +646,6 @@ public void onDestroy() {
                 isUploadServiceConnected = false;
             }
         }
-
-        if (placesDisposable != null) {
-            placesDisposable.dispose();
-        }
     }
 
     @Override