Improves warning message when no parts are found for a message.

GoWSDL only supports document/literal wrapped WS-I compliant services
and will fail generating code for a WSDL that doesn't comply with this.

gowsdl.go

@@ -413,9 +413,10 @@ func (g *GoWSDL) findType(message string) string {
  // Message does not have parts. This could be a Port
  // with HTTP binding or SOAP 1.2 binding, which are not currently
  // supported.
- log.Println("WSDL does seem to have HTTP or SOAP 1.2 binding which is not currently supported.")
+ log.Printf("[WARN] %s message doesn't have any parts. It is probably part of HTTP or SOAP 1.2 bindings which are unsupported, ignoring message...", msg.Name)
  continue
  }
+
  part := msg.Parts[0]
  if part.Type != "" {
  return stripns(part.Type)