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Fixes the Gold interaction code not properly handling the case where a
bug on Gold's end prevents it from writing a triage link to the provided
file.

Bug: 1124368
Change-Id: Ic3e9a4d8808b97831fba1c4f42338b6b1435acde
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2391505
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Sven Zheng <svenzheng@chromium.org>
Auto-Submit: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Sven Zheng <svenzheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804107}