codacy: Document empty method body

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

src/main/java/com/owncloud/android/ui/activity/UploadFilesActivity.java

@@ -230,6 +230,7 @@ public class UploadFilesActivity extends DrawerActivity implements LocalFileList
 
             @Override
             public void onNothingSelected(AdapterView<?> parent) {
+                // no action
             }
         });