Fixed error in MainPresenter

- Pretty dumb mistake, didn't put a reference to mMainView within the
if statement that checks if it isn't null

app/src/main/java/srct/whatsopen/presenters/MainPresenter.java

@@ -64,11 +64,12 @@ public class MainPresenter {
                     @Override
                     public void onError(Throwable e) {
                         updateOpenStatus();
-                        if(mMainView != null)
+                        if(mMainView != null) {
                             mMainView.dismissProgressBar();
                             Toast.makeText(mMainView.getContext(), "Error getting data; " +
                                            "schedules may be out of date.", Toast.LENGTH_LONG).show();
                         }
+                    }
                     @Override
                     public void onNext(List<Facility> facilities) {
                         writeToRealm(facilities);