add extended error handling to create group function

Author: sszepe

dspace_rest_client/client.py

@@ -1582,8 +1582,19 @@ def create_group(self, group, embeds=None):
         response = self.create_dso(url, params=parse_params(embeds=embeds), data=data)
         response_json = parse_json(response=response)
 
-        if response_json:
+        if response.status_code == 201 and response_json:
             return Group(api_resource=response_json)
+        elif response.status_code == 401:
+            logging.error("You are not authenticated")
+            return None
+        elif response.status_code == 403:
+            logging.error("You are not logged in with sufficient permissions")
+            return None
+        elif response.status_code == 422:
+            logging.error(
+                "The name was omitted or already exists, if permanent was set to true"
+            )
+            return None
         else:
             logging.error("Group creation failed. Check API response for details.")
             return None