Update cols.yaml from scratch

Signed-off-by: noopur <[email protected]>

tests/end_to_end/models/model_owner.py

@@ -233,8 +233,7 @@ def register_collaborators(self, plan_path, num_collaborators=None):
             with open(cols_file, "r", encoding="utf-8") as f:
                 doc = yaml.load(f, Loader=yaml.FullLoader)
 
-            if "collaborators" not in doc.keys() or not doc["collaborators"]:
-                doc["collaborators"] = []  # Create empty list
+            doc["collaborators"] = []  # Create empty list
 
             for i in range(num_collaborators):
                 col_name = "collaborator" + str(i+1)