fix: Default to pandas mode if not specified in ODFV proto in database

Signed-off-by: Bhargav Dodla <bdodla@expediagroup.com>

Author: Bhargav Dodla

sdk/python/feast/on_demand_feature_view.py

@@ -346,7 +346,7 @@ def from_proto(
             ],
             sources=sources,
             feature_transformation=transformation,
-            mode=on_demand_feature_view_proto.spec.mode,
+            mode=on_demand_feature_view_proto.spec.mode or "pandas",
             description=on_demand_feature_view_proto.spec.description,
             tags=dict(on_demand_feature_view_proto.spec.tags),
             owner=on_demand_feature_view_proto.spec.owner,