Null context ContentResolver crash
Reported via ACRA:
USER_COMMENT=
ANDROID_VERSION=6.0.1
APP_VERSION_NAME=0.98
BRAND=google
PHONE_MODEL=Nexus 6P
CUSTOM_DATA=
STACK_TRACE=java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.ContentResolver android.content.Context.getContentResolver()' on a null object reference
at org.fdroid.fdroid.data.AppProvider$Helper.categories(AppProvider.java:90)
at org.fdroid.fdroid.views.fragments.AvailableAppsFragment$CategoryObserver$1.run(AvailableAppsFragment.java:95)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)