Check mIndexes nullability is ExtendedListFragment.java

Signed-off-by: alperozturk <alper_ozturk@proton.me>

app/src/main/java/com/owncloud/android/ui/fragment/ExtendedListFragment.java

@@ -454,18 +454,21 @@ public class ExtendedListFragment extends Fragment implements
      * Restore index and position
      */
     protected void restoreIndexAndTopPosition() {
-        if (mIndexes.size() > 0) {
-            // needs to be checked; not every browse-up had a browse-down before
+        if (mIndexes == null || mIndexes.isEmpty()) {
+            Log_OC.d(TAG,"Indexes is null or empty");
+            return;
+        }
 
-            int index = mIndexes.remove(mIndexes.size() - 1);
-            final int firstPosition = mFirstPositions.remove(mFirstPositions.size() - 1);
-            int top = mTops.remove(mTops.size() - 1);
+        // needs to be checked; not every browse-up had a browse-down before
 
-            Log_OC.v(TAG, "Setting selection to position: " + firstPosition + "; top: "
-                + top + "; index: " + index);
+        int index = mIndexes.remove(mIndexes.size() - 1);
+        final int firstPosition = mFirstPositions.remove(mFirstPositions.size() - 1);
+        int top = mTops.remove(mTops.size() - 1);
 
-            scrollToPosition(firstPosition);
-        }
+        Log_OC.v(TAG, "Setting selection to position: " + firstPosition + "; top: "
+            + top + "; index: " + index);
+
+        scrollToPosition(firstPosition);
     }
 
     private void scrollToPosition(int position) {