Fix NPE when querying EF Uri with non-existent subscription

Bug: 194910795
Test: atest TeleServiceTests:SimPhonebookProviderTest
Merged-In: Ic214b46600759e2c73a90bc50ef971d80303055d
Change-Id: Ic321fd065ea6875e5233c0983b0520d5ca06a977
(cherry picked from commit 8151e2b159f54f97ec44bc88dd863801608886b5)
2 files changed