Catch NoSuchElementException in SyncManager.

There is a possibility that the sync adapter active context
was never registered with the IBinder so we can get an exception
while unbinding the service - catch the exception and log a wtf
when this occurs.

Fixes: 350602913
Test: builds/flashes
Flag: EXEMPT bugfix
Change-Id: I691e825c5b88222bcff174e8dc4751e53f1a3df2