Bug: diffs failing to expand on merge request changes tab

Summary

In certain cases the diff fails to expand on the Merge Request diff view. It isn't immediately clear why

Example Project

Blogpost text: gitlab-com/www-gitlab-com!19379 (diffs)

What is the current bug behavior?

Diff does not render by default and does not show message indicating diff is purposefully collapsed.

What is the expected correct behavior?

Diff should render or show message indicating diff is purposefully collapsed.

Relevant logs and/or screenshots

Image_2019-02-21_at_10.27.55

Output of checks

This bug happens on GitLab.com

Possible fixes

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