crash_sender: ignore missing files to prevent upload failure

Don't try to upload missing files, instead send the reports without them to
avoid failure in curl, breaking the cycle of try-fail-try-fail.

BUG=chromium:338977
TEST=manual test by copying the script to a Chromebook
CQ-DEPEND=CL:200061

Change-Id: If35828b48b7746bdfae519e4777cc0d7e9245e0e
Reviewed-on: https://chromium-review.googlesource.com/199070
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
1 file changed