Handle ICE candidates with missing usernameFragment
#181
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I ran into an error because
flutter-webrtc
(https://github.com/flutter-webrtc/webrtc-interface/blob/767eb083a9ee88a4e37b49cb70bb7831c7c2414d/lib/src/rtc_ice_candidate.dart#L6) doesn't seem to send this field.The ICECandidate type spec already allows the field to be nil. This PR would also allow candidates where the
usernameFragment
field is not present at all.