[aaron-gh]

Opening Backtalk's settings just after Backtalk is updated or restarted could crash it with a NullPointerException:

TalkBackService.getTalkBackExitController
TalkBackPreferenceFragment.disableTalkBackExitWatermark
TalkBackPreferenceFragment.onResume

TalkBackService.getInstance() returns the service from onCreate, but the service's pipeline is only made in onServiceConnected. The settings screen can resume in between. getTalkBackExitController then made the controller from the null pipeline.

getTalkBackExitController now returns null until the service is connected. TalkBackPreferenceFragment and ListMenuManager already handle null. reloadPreferences now does too.

Tested:

• Seen on an Android 17 emulator when settings opened right after Backtalk was reinstalled.
• A unit test checks that the service has no controller before it is connected. Without the fix, it fails with the same NullPointerException.
• The same reinstall-then-open sequence didn't crash in two runs after the fix. The logs don't show whether those runs hit the same timing.