don't error on missing fields in compressed str

app.py

@@ -73,8 +73,8 @@ class ModelData:
             hotkey=hotkey,
             namespace=tokens[0],
             name=tokens[1],
-            commit=tokens[2] if tokens[2] != "None" else None,
-            hash=tokens[3] if tokens[3] != "None" else None,
+            commit=tokens[2] if tokens[2] != "None" else "",
+            hash=tokens[3] if tokens[3] != "None" else "",
             competition=tokens[4] if len(tokens) > 4 and tokens[4] != "None" else DEFAULT_COMPETITION_ID,
             block=block,
             incentive=incentive,