tree b0f9a76c0582fa2c849d5c4841249c7afbc5a9f3
parent 79fb821d2c265bc26ecf094413f0ac9ae34c3300
author River Riddle <riverriddle@google.com> 1562971778 -0700
committer Mehdi Amini <joker.eph@gmail.com> 1562978588 -0700

NFC: Don't print the location of a diagnostic if it is unknown.

Printing 'loc(unknown)' just clutters the output with unhelpful information.

PiperOrigin-RevId: 257883717