Bluetooth: Prevent BT crash using adb commands

Use case:
1) Start OppLauncher activity or PbapActivity
   using adb shell command

Failure:
"Unfortunately, Bluetooth share has stopped" error comes.

Root cause:
Observed NPE because no action was supplied during opening
activity.

Fix:
Add NULL check before process action value to prevent force
close in profile.

Fixes: 119540033
Test: Performed sanity with above mentioned use case.
Change-Id: Ic9cc8079fd2c1c8b82c5b5062f253828483ed7e9