In tests tearDown() method, ignore IllegalArgumentException
from unregisterReceiver method.
Sometimes the tests may have failed to register a receiver.
In such cases, trying to unregister it later on in tearDown() is unnecessary
and so ignore IllegalArgumentException from unregisterReceiver.

Bug: 23778283
Change-Id: Iabaa893ea80a608f4b9208b269149a3ef60da6a2
3 files changed