Is codec.sdpFmtpLine present when there is no fmtp line in the SDP?

[fippo]

Which is typically the case for VP8 which has no parameters. In Chrome this leads to

while sdpFmtpLine is defined as

DOMString     sdpFmtpLine;

here.

It seems like this should only exist when the codec has a fmtp line? No code changes required but we might need some WPT updates.

[alvestrand]

It's a dictionary, so omitting members is allowed, and I think it should be required to omit it when there is no fmtp line. (If there's "a=fmtp:96:" in the SDP, there should be an empty string there, of course.)

[fippo]

oh we have that special-case of empty fmtp line for stats too courtesy of @dontcallmedom!