webrtchttp: Allow audio or video caps to be specified as None with WHEP
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Equinix is shutting down its operations with us on April 30, 2025. They have graciously supported us for almost 5 years, but all good things come to an end. We are expecting to transition to new infrastructure between late March and mid-April. We do not yet have a firm timeline for this, but it will involve (probably multiple) periods of downtime as we move our services whilst also changing them to be faster and more responsive. Any updates will be posted in freedesktop/freedesktop#2011 as it becomes clear, and any downtime will be announced with further broadcast messages.
We were setting audio and video caps by default even when the user
might have requested only video or audio. This would then result
in a Could not reuse transceiver error from the webrtcbin.
Fix this by allowing the user to specify audio or video caps as None. This allows us to maintain the earlier behaviour for backward compatibility while allowing the user to not request audio or video as need be.
Fixes #484 (closed).