Don't try to import wsdl files which have no location

Author: mvantellingen

src/zeep/wsdl/wsdl.py

@@ -255,8 +255,14 @@ def parse_imports(self, doc):
         for import_node in doc.findall("wsdl:import", namespaces=NSMAP):
             namespace = import_node.get('namespace')
             location = import_node.get('location')
-            location = absolute_location(location, self.location)
 
+            if not location:
+                logger.debug(
+                    "Skipping import for namespace %s (empty location)",
+                    namespace)
+                continue
+
+            location = absolute_location(location, self.location)
             key = (namespace, location)
             if key in self.wsdl._definitions:
                 self.imports[key] = self.wsdl._definitions[key]