[am] catch IllegalArgumentException from getHarmfulAppWarning

A missing package should not cause system_server crash.

BUG: 253989182
Test: builds
Merged-In: I55fd685280ea6a3d08b9c838b2245ed6dec0aa56
Change-Id: I55fd685280ea6a3d08b9c838b2245ed6dec0aa56
(cherry picked from commit 20e4747134c49501e67a1b0df1fe17f350937787)
1 file changed