Handle potential IllegalStateExceptions in Telecom.

The EmergencyNumber APIs can potentially throw an IllegalStateException
in some cases.  Adding catch blocks to ensure they don't crash Telecom.

Test: Run telecom unit tests.
Bug: 134100020
Fixes: 152231444
Merged-In: I1705c44e93fe9cdf64feb78f307364f6ec098aad
Change-Id: I1705c44e93fe9cdf64feb78f307364f6ec098aad
(cherry picked from commit b431b6be)