Better to associate true for "enable" and false for "disable".

The code reads better this way, and certainly is easier on human brain
to process their logic.

Change-Id: I3150fca3385931b9fe01ad13cb11fab410331349
Let's be more defensive here by checking for null return objects.

Change-Id: I5164e7d82f882ea9fe296a5a2df616d396d6726f