4006: not diff shown despite of actual diff

wisechengyi

What version are you running?

RBTools 0.6.3

What's the URL of the page containing the problem?

https://rbcommons.com/s/twitter/r/3062/diff/1-2/ at line 131

What steps will reproduce the problem?

This is probably not deterministic or related
1. ./rbt post -o -g (rb # given)
2. realizing the parent is incorrect, ./rbt post -o -r <rb#> --parent=<some SHA>
2. made some commit, ./rbt post -o -r 3062, got a new draft
3. realizing the parent is incorrect again, ./rbt post -o -r <rb#> --parent=<some SHA>
4. the issue showed up

What is the expected output? What do you see instead?

process.destroy() should be highlighted

What operating system are you using? What browser?

osx yosemite, chrome

Please provide any additional information below.