Fix the create_message function for clients with no default service.

Even though the Client.create_message function expects a service
parameter, this service was not passed on to the SOAP implementation.
The SOAP binding would invariably use the default service in the client
object, and raise an exception if it was not found.

Fix this by adding an optional service parameter to the
SoapBinding.create method as well.

Fixes mvantellingen#833

src/zeep/client.py

@@ -148,7 +148,7 @@ def create_message(self, service, operation_name, *args, **kwargs):
 
         """
         envelope, http_headers = service._binding._create(
-            operation_name, args, kwargs, client=self
+            operation_name, args, kwargs, client=self, service=service
         )
         return envelope
 

src/zeep/wsdl/bindings/soap.py

@@ -59,7 +59,7 @@ def create_message(self, operation, *args, **kwargs):
         envelope, http_headers = self._create(operation, args, kwargs)
         return envelope
 
-    def _create(self, operation, args, kwargs, client=None, options=None):
+    def _create(self, operation, args, kwargs, client=None, options=None, service=None):
         """Create the XML document to send to the server.
 
         Note that this generates the soap envelope without the wsse applied.
@@ -78,8 +78,11 @@ def _create(self, operation, args, kwargs, client=None, options=None):
 
         # Apply ws-addressing
         if client:
+            if service is None:
+                service = client.service
+
             if not options:
-                options = client.service._binding_options
+                options = service._binding_options
 
             if operation_obj.abstract.wsa_action:
                 envelope, http_headers = wsa.WsAddressingPlugin().egress(