settings: FC on quick settings editor on tablets without a vibrator

Change-Id: Ie824c3c958120d896690f369cf77eacf1e74c735
JIRA: CYAN-4296
Issue: https://jira.cyanogenmod.org/browse/CYAN-4296
Signed-off-by: Jorge Ruesga <jorge@ruesga.com>
Settings: Fix isPackageInstalled logic.

    - If package is null, isPackageInstalled returned true.
    - Return false if null, always.
    - PS2: Fix codestyle
Change-Id: If2bf41e4c9520195d56e327a447d7085daab3154