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
SystemUI: Allow translucent navigation bar in landscape mode.

Change-Id: I5388f3f8a34533624619714bacfba52f95fc6d85
frameworks/base: Update timelapse quality check

Updated timelapse quality check to include WQVGA

Change-Id: Ic2ef9ad78cbbc2daa14ff5e95ff3cfb6e10a7529