never attach null functor
never attach null functor

bug:6412902

Change-Id: I26a5f80ae13cc19df3daa4d4e7e5401778f76dbb

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base