Check if view is inited when screen rotated

In M, we need to request permission the first time
application is use it. And we put that before
the creation of the content view. If screen
rotated before user confirm the permission dialog box,
it will cause onConfigurationChanged to be called,
and refreshs the view which is not created yet.
Add a null pointer checking to avoid that.

FEIJ-1083

Change-Id: Ic3c762e62edef28d4c5d7a7a89fabec3f4324eca