[webrtc-stats] sdmFmtpLine value space (#588)

dontcallmedom has just created a new issue for https://github.com/w3c/webrtc-stats:

== sdmFmtpLine value space ==
[sdpFmtpLine  is defined](https://w3c.github.io/webrtc-stats/#dom-rtccodecstats-sdpfmtpline) as
 > The a=fmtp line in the SDP corresponding to the codec, i.e., after the colon following the PT. This defined by [JSEP] in Section 5.7. 

at least in chrome, this results with the value `undefined` when there is nothing coming after the colon in PT; is this the expected value or should it be the empty string?

(right now, the tests in Web Platform Tests expects a non-undefined value)

Please view or discuss this issue at https://github.com/w3c/webrtc-stats/issues/588 using your GitHub account


-- 
Sent via github-notify-ml as configured in https://github.com/w3c/github-notify-ml-config