DialogFragement: Add null pointer check for mDialog for protection

DialogFragement can be dissmissed just after the Dialog is
established. This will cause NullPointerException.

Add null pointer check for mDialog for protection

CRs-fixed: 549689

Change-Id: If57f81d03a8ec2906598363b681ea38806fb2a90
ChooseTypeAndAccountActivity: Fix the Null pointer Exception of monkey test

ChooseTypeAndAccountActivity crashed during monkey test, due to Null
pointer exception occurred.

To fix this issue, Add Null pointer check before we use it.

CRs-Fixed: 478250

Change-Id: Iae3e331edfda238ecb0c6d5d32b15329b1dfee0b
Bluetooth: Fix to avoid object leaks during BT OFF

A case where script is running to do BT ON/OFF 2000 times,
Each time while turning off BT FULL_CONNECTED_ASYNC_CHANNEL
is disconnected by Pan Service. HALF_CONNECTED_ASYNC_CHANNEL
is not disconnected, which leads memory leak in Pan Service
object as messenger passed by PanService & ASYNC Channel object.
which are still referred from BT tethering framework code. So GC
does not claim for these objects. HALF_CONNECTED_ASYNC_CHANNEL
should be disconnected, once FULL_CONNECTED_ASYNC_CHANNEL
is disconnected to solve this issue.

Change-Id: I5a7a2beb0169a755cf4f3f37fd0a0ab7d08fd9e5
CRs-Fixed: 591180
 Audio: SetForceUse config check in AudioService

 - Audio is routed to headset when BT is turned off while audio is
   played on speaker
 - Mediarouter does not have setForce device information when app forces
   audio to speaker. So while disconnecting BT, MediaRouter is routing
   audio to headset instead of speaker.
 - Added check for setforce config in AudioService.

 CRs-Fixed: 578316

Change-Id: Ie929f407bfa12eacd29cf36031024a4a6a979b63
Mms: Fix FC issue that when tapping contact icon many times

Add protection to check the extra string info from bundle before making
the URI, to avoid null pointer exception.

CRs-Fixed: 534089

Change-Id: Ie8c78ca42c290e16afa1fefeb01ea67c8e963b06