Restore check for nil writePipe in WebRTCPeer.Close
I removed this check in 047d3214bfb46de07e5d9f223e4fb1ba24584c8a because NewWebRTCPeer
always initializes writePipe
, and it is never reset to nil
. However tests used &WebRTCPeer{}
which bypasses NewWebRTCPeer
and leaves writePipe
set to nil
.
From comment:3:ticket:34049.