Null checks. Fixes https://github.com/austinhuang0131/barinsta/issues/303

app/src/main/java/awais/instagrabber/customviews/PostsRecyclerView.java

@@ -283,9 +283,13 @@ public class PostsRecyclerView extends RecyclerView {
     }
 
     public void refresh() {
+        if (lazyLoader != null) {
             lazyLoader.resetState();
+        }
+        if (postFetcher != null) {
             postFetcher.reset();
             postFetcher.fetch();
+        }
         dispatchFetchStatus();
     }