DeskClock: Fix NullPointerException in AlarmClockFragment

RingtoneManager.getRingtone could return null so add a check for that

Change-Id: Ic3ec042e7c3fe02eee6388a469f19624d90fdddd
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Change-Id: Ifc18a40d1392beb255f2a29721b24a0a9a47732a
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Change-Id: I3fa56f5f124c58f1e292799243c1943afc63d746
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Change-Id: Ic6efc48ae2ef9023ab9a2cd4f0650ae15130a913
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Change-Id: I33dba6f206199ae7f044b29bb429631002e712ab
Merge remote-tracking branch 'cm11/cm-11.0' into kk-4.4