Crash: Fragment State loss exception

[maskaravivek]

The app is crashing as we are trying to commit the fragment onPostExecute call of an AsyncTask but theres a possibility that the onSaveInstanceState has already been called for it. Here's a blog post explaining why this happens.

FATAL EXCEPTION: main Process: fr.free.nrw.commons, PID: 10644
java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
 at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1842)
 at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1860)
 at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:649)
 at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:609)
 at fr.free.nrw.commons.nearby.NearbyActivity.setListFragment(NearbyActivity.java:247)
 at fr.free.nrw.commons.nearby.NearbyActivity$NearbyAsyncTask.onPostExecute(NearbyActivity.java:219)
 at fr.free.nrw.commons.nearby.NearbyActivity$NearbyAsyncTask.onPostExecute(NearbyActivity.java:166)
 at android.os.AsyncTask.finish(AsyncTask.java:651)
 at android.os.AsyncTask.-wrap1(AsyncTask.java)
 at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:668)
 at android.os.Handler.dispatchMessage(Handler.java:102)
 at android.os.Looper.loop(Looper.java:148)
 at android.app.ActivityThread.main(ActivityThread.java:5417)
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

The issue is similar to #435 but its because of a different code path. And the fix in this case would be different as described in the blog post.