Mohamed Chibani authored Jun 30, 2021 and Sébastien Blin committed Jul 02, 2021

Currently, when an empty offer is received, a media offer is
generated with audio, and video if enabled in the account.
Now, the generated offer will include only audio. Both
participants can add video to the call if they wish.
Also some code clean-up

Gitlab: #556

Change-Id: Id51bf44b2b84fd9341de4b67bf53963614088ef8