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This reverts commit ed8ef709.

Reason for revert: space after "," is buggy

Original change's description:
> Amend dom-distiller script for bug ID handling
> 
> "None" would be ignored, and add space after ",".
> 
> Bug: None
> Change-Id: I85167f2e9ba0cea7affd754825fd34e817568bd5
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2304337
> Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
> Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#789569}

TBR=dmazzoni@chromium.org,wychen@chromium.org

Change-Id: I9be25d3af31be50e0ee3a608091c31a5b1c2ff6e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: None
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2304960Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Commit-Queue: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789596}