Log an error on package not found in DefaultPermissionGrantPolicy

Currently information on which package was not found is lost, e.g.
https://buganizer.corp.google.com/issues/123042772#comment9

Bug: 123042772
Test: presubmit
Change-Id: I2566364c56c1752c05047a32ee5ceb8b9ea996f8
1 file changed