Adding a period to the end of the FQDN in the 'Server address' box in the Linux HC app results in SSL errors

Summary

Adding a period to the end of the FQDN in the 'Server address' box results in SSL errors in the Linux app.

Environment

HipChat Linux app v4.0.1641+

Steps to Reproduce

1. Open the HipChat app
2. Select 'Get Started' under the 'Log in to a HipChat team Server' section
3. Enter in a valid HipChat Server FQDN and add a period at the end of it. (i.e chat.mycompany.com.)
4. If valid, the login page will appear and you'll see a red lock at the top of the page.
5. Upon logging in, you'll receive an error:
   

Notes

Does not appear to affect the Mac app, but does affect the Windows app (see HCPUB-1339)

Workaround

Remove the period from the FQDN.