This should avoid npe on theme change for devices without navbars
https://github.com/CyanogenMod/android_frameworks_base/commit/ae41fbc6946fe98bfc3cfd6143fac847c85a1216

and

https://github.com/CyanogenMod/android_frameworks_base/commit/e95bc124c629cef485bb7ac4ce55137bf500f772

Change-Id: I1bba0e4879713c3bb03c181f2314b72b8e932223