default to empty builder

Author: rusenask

dotscience/__init__.py

@@ -679,8 +679,8 @@ def _initiate_build(self, model_id):
         the_exc = None
         while attempt < 120:
             attempt += 1
-            try:
-                resp = requests.post(self._hostname+f"/v2/models/{model_id}/builds", auth=self._auth, json={"builder":  os.getenv(ENV_DOTSCIENCE_BUILDER)})
+            try:               
+                resp = requests.post(self._hostname+f"/v2/models/{model_id}/builds", auth=self._auth, json={"builder": os.getenv(ENV_DOTSCIENCE_BUILDER, default='')})
                 if resp.status_code != 201:
                     raise Exception(f"Error {resp.status_code} on POST to /v2/models/{model_id}/builds: {resp.content}")
                 build = resp.json()