message: Fix bub on Transport.dump() when passing a custom udpdumper
diff: @@ -200,7 +200,7 @@ class Transport
  if (!this.transport.Dump(filename, incoming, outgoing, rtcp, rtpHeadersOnly))
  throw new Error("Could no dump to pcap file");
  //Check if we are dumping bwe
  - if (bwe)
  + if (bwe && typeof filename==="string")
  //Start dumping
  if (!this.transport.DumpBWEStats(filename.replace(".pcap",".csv")))
  throw new Error("Could no dump to bwe csv file");
  