[Help Wanted] JavaScript errors when refreshing the page

[jasonblais]

I confirm (by marking "x" in the [ ] below):

• This is not a troubleshooting question. Troubleshooting questions go here: http://www.mattermost.org/troubleshoot/.
• This doesn't reproduce on web browsers (such as in Chrome). If it does, issue reports go to the Mattermost Server repository.
• I have read contributing guidelines.

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Summary
JavaScript errors when refreshing the page

Steps to reproduce

Windows 10; Mattermost Desktop v3.6; Mattermost Server v3.6

1. Go to View > Toggle Developer Tools
2. On the Developer console, choose "Console"
3. Refresh the page

Expected behavior

No JavaScript errors

Observed behavior

[jnugh]

I'll have a look right away. I don't remember those messages to be honest but maybe I introduced them with one of the later commits of my PR and simply didn't check again.