Settings: fix NPE with null check on NFC adapter

Verifies the adapter is not null before dereferencing it and log and error if so

Change-Id: Id2a34c4698a97476bee9b78cb0ac7b980d1595cf
[1/2] settings: Set AdvancedReboot to be enabled by default
RE: http://jira.omnirom.org/browse/OMNI-1

Fixing as I am a stupid head

Edit 9001: Setting this to be enabled by default for all users

Change-Id: I08a0e0cbe821e4d2dad6cf2a9ac20721cd19d69b
Merge "[1/2] settings: Set AdvancedReboot to be enabled by default RE: http://jira.omnirom.org/browse/OMNI-1" into android-4.4
Merge "Settings: fix NPE with null check on NFC adapter" into android-4.4
merge changes from Omni 4.4 into local branch