Add exception catching for BlockedNumberContract methods used by Telecom.

The content resolver can throw in some instances when using the blocked
number provider.  Rather than crashing all of telecom, adding exception
handling to provide graceful fallback in these cases.

Test: Compile / build
Bug: 74965829
Change-Id: I2e1accce3ed6fac4ec2b8e6a92585abf630b84fe