Crush on SessionDetailFragment

[kwmt]

Overview (Required)

• When language setting is change on SessionDetailFragment (activity is recreated), NPE occurs.

03-10 09:55:28.344 27594 27594 E SessionDetailFragment: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.app.Activity.setTheme(int)' on a null object reference
03-10 09:55:28.344 27594 27594 E SessionDetailFragment: 	at io.github.droidkaigi.confsched2017.view.fragment.SessionDetailFragment.initTheme(SourceFile:72)
03-10 09:55:28.344 27594 27594 E SessionDetailFragment: 	at io.github.droidkaigi.confsched2017.view.fragment.SessionDetailFragment.lambda$onCreateView$0(SourceFile:101)
03-10 09:55:28.344 27594 27594 E SessionDetailFragment: 	at io.github.droidkaigi.confsched2017.view.fragment.SessionDetailFragment$$Lambda$1.run(Unknown Source)
03-10 09:55:28.344 27594 27594 E SessionDetailFragment: 	at io.reactivex.internal.observers.CallbackCompletableObserver.onComplete(SourceFile:52)
03-10 09:55:28.344 27594 27594 E SessionDetailFragment: 	at io.reactivex.internal.operators.completable.CompletableObserveOn$ObserveOnCompletableObserver.run(SourceFile:90)
03-10 09:55:28.344 27594 27594 E SessionDetailFragment: 	at io.reactivex.android.schedulers.HandlerScheduler$ScheduledRunnable.run(SourceFile:109)
03-10 09:55:28.344 27594 27594 E SessionDetailFragment: 	at android.os.Handler.handleCallback(Handler.java:739)
03-10 09:55:28.344 27594 27594 E SessionDetailFragment: 	at android.os.Handler.dispatchMessage(Handler.java:95)
03-10 09:55:28.344 27594 27594 E SessionDetailFragment: 	at android.os.Looper.loop(Looper.java:148)
03-10 09:55:28.344 27594 27594 E SessionDetailFragment: 	at android.app.ActivityThread.main(ActivityThread.java:5417)
03-10 09:55:28.344 27594 27594 E SessionDetailFragment: 	at java.lang.reflect.Method.invoke(Native Method)
03-10 09:55:28.344 27594 27594 E SessionDetailFragment: 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
03-10 09:55:28.344 27594 27594 E SessionDetailFragment: 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

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