Fix a crash on review requests without diffs.
Review Request #10412 — Created Feb. 16, 2019 and submitted — Latest diff uploaded
The new commit list field made an assumption that all review requests
had diffsets associated with it, and would crash when the diffset came
back asNone
. This is a simple fix that handles the cas of an empty
diffset more gracefully.
Loaded a review request that didn't have a diffset. Saw that the page
loaded without crashing.