code: func UnmarshalChannelHeaderOrPanic(bytes []byte) *cb.ChannelHeader {
  	chdr, err := UnmarshalChannelHeader(bytes)
  	if err != nil {
  		panic(err)
  	}
  	return chdr
  }
docs: // UnmarshalChannelHeaderOrPanic unmarshals bytes to a ChannelHeader or panics
  // on error