I've an activity, inside it a fragment and inside fragment other fragments with viewpager.
When I rotate the screen and select another tab in fragment app crashes.

Steps to reproduce:
- Create an AppCompatActivity that contains a fragment
- Fragment contains ViewPager + Tabs
- Each Fragment calls setRetainInstanceState(true)
- Assign a FragmentStatePagerAdapter to the ViewPager
- Run the app and rotate the screen, then switch tab

Tested on:
Nexus 6P
Android 6.0.1

Stack trace:
java.lang.NullPointerException: Attempt to invoke virtual method 'android.os.Handler android.support.v4.app.FragmentHostCallback.getHandler()' on a null object reference
at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:1623)
at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:637)
at android.support.v4.app.FragmentStatePagerAdapter.finishUpdate(FragmentStatePagerAdapter.java:166)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1235)
at android.support.v4.view.ViewPager.populate(ViewPager.java:1083)
at android.support.v4.view.ViewPager$3.run(ViewPager.java:272)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)
at android.view.Choreographer.doCallbacks(Choreographer.java:670)
at android.view.Choreographer.doFrame(Choreographer.java:603)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:844)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Issue 37112246

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