SamsungQualcommRIL: fix handoff for good.

OperatorCheck: Add last known of good config when the array is null.
When the radio reset, it calls data connect. This fixes cases where
data is null because of this issue and causes apn to be null out.

Change-Id: Ic8e1d22f56db77ef698d3a89ecf27d30a7a2ddd8