The summary and description can be improved here. We generally don't need to list bug numbers or versions there, since that data is elsewhere in the review request fields (branch / bugs fields).
See https://www.notion.so/reviewboard/Writing-Good-Change-Descriptions-10529e7c207743fa8ca90153d4b21fea for our guide on what we like to see for the summary and description.

It's just a tiny style nitpick, but can we add a blank line between these two please?

Getting pretty close. Can we make a couple little tweaks in the description?
Please wrap it to 70 columns.
The first line there duplicates what you have in the summary, and can be deleted.
We don't need to include quite so much actual code snippet in the description--if I want to know exactly what the code does, I'll look at the diff. Let's just say that if the draft exists, we get the draft summary, otherwise we get it from the published review request.

Let's add a trailing comma at the end of this line.

Looks like the description is wrapping a bit too early. Can you target ~70 (upwards of 75) characters for the wrap point? Helps keep it from appearing really short. A good trick is to compose it in an editor with a wrap point (Review Board doesn't do this built-in because different companies/teams have different requirements).

Just a couple very minor comments about your review request metadata:

In your description, you use "CR", which isn't an abbreviation that we use in the codebase. Let's say "summary for the review request".

In testing done, it's better to use ./tests/runtests.py rather than nosetests. They're mostly the same thing, but just to be consistent let's prefer the former. You also don't necessarily need to include the output from the suite, you can just say you ran the unit tests.

Ship It!