Skip sanitizing location info for Null Barring CID

If the CellIdentity in BarringInfo is null, then it
doesn't need to be location-info sanitized before
being provided.

Bug: 148695512
Test: atest CarrierApiTest
Merged-In: I8db108a91bcfcdefb48ff3779d972e126bc1d7d2
Change-Id: I8db108a91bcfcdefb48ff3779d972e126bc1d7d2
(cherry picked from commit 5f8ab16877c1bfb20891a43a721edd72721f8c04)
1 file changed