Ben Clayton 1a61e8613e formatter: Remove colon line prefix with no source
If a diagnostic has no Source information, don't start the diagnostic line with a colon.

Bug: tint:282
Change-Id: I80c4103e31556b2769d4b4c2a98dce21a2e1c233
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/31662
Reviewed-by: dan sinclair <dsinclair@chromium.org>
Commit-Queue: Ben Clayton <bclayton@google.com>
2020-11-03 18:27:29 +00:00
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