Return OK if batch is ensured to exist in Setra

setra_client/client.py

@@ -263,7 +263,11 @@ class SetraClient(object):
                              data=batchdata.json(),
                              headers=headers,
                              return_response=return_response)
-        return response
+        if response.status_code in (409, 202):
+            return 'OK'
+        else:
+            response.raise_for_status()
+            return response
 
     def get_batch_complete(self, batch_id: str):
         """