Talk Administration UI: Allow the user to leave the STUN Server parameter blank

[pmarini-nc]

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Is your feature request related to a problem? Please describe.
While there is a warning sign when emptying the name of the STUN server parameter, the settings are still saved. This currently leads to an error that prevents the user to stream media, audio and video alike. The exact error is "Error while accessing microphone & camera" in Firefox.

Describe the solution you'd like
In some cases the instance doesn't need a STUN server (for example when all the users are on the same internal network) so that it should be possible to leave it empty and still be able to stream media, if all the other conditions are fulfilled.

Describe alternatives you've considered

Additional context