[Help Wanted] JavaScript error after refreshing the app

[jasonblais]

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• 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 error after refreshing the app

Steps to reproduce

1. Open the Developer console from View > Toggle Developer Tools, then choose "Console"
2. Refresh the app

Expected behavior
No JavaScript error

Observed behavior

Possible fixes

This would be gone by removing initial nodeIntegration attribute from webview. It's unknown, so reported as warning by React. Existing tests would check whether node integration is correctly disabled.

[yuya-oc]

Closed via b1d586e