Properly null check all button usages.

Users might have hidden them.

Change-Id: I7f52d570cf4ef0833c6bde9159475345d581a00f
Call to equals() comparing different types (FindBugs)

Call to HashSet<PrintServiceInfo>.equals(ArrayList<PrintServiceInfo>).
The result of this comparison will always be false.

Change-Id: Ic8cc6eab99cea4c7b3841faf6bc84c246273e8d0
Fix: Fix for ambiguous and broken disk formatting dialog

Part of the original patch was lost in abbe71facf4cc00d1c947ec8f1606281ce51c67f

Change-Id: I5621dff3cfd12a173b0d793398cf729333f97263
Merge "Call to equals() comparing different types (FindBugs)" into cm-11.0
Merge "Fix: Fix for ambiguous and broken disk formatting dialog" into cm-11.0
Merge remote-tracking branch 'cm/cm-11.0' into cm-11.0