Stop throwing exceptions in TouchExplorer

These crash the system. Resetting and trying to muddle
through seems like a better solution than restarting
the device.

Bug: 68269250
Test: make, try TalkBack a bit. The crashes were so rare that
the code I'm changing *almost* never executes.

Change-Id: I7931417832cb2ce39de5c8b00312c12354d76803