This patch fixes some NPEs occuring in the onReceive method of
LocalService.java.
A user reported that it crashed when the system was closing the app.
It is a clue that tells that we were accessing elements from onReceive
being triggered, after these elements were deallocated.

Change-Id: I1ef4cdb56904ba0ebd7bd7839b83ea9243d78cbc
Tuleap: #859