Make sure labeling data do not fail due to media type issues and improve error message

Author: Val Brodsky

libs/labelbox/src/labelbox/schema/labeling_service_dashboard.py

@@ -121,7 +121,8 @@ def get(cls, client, project_id: str) -> 'LabelingServiceDashboard':
         result = client.execute(query, {"id": project_id}, experimental=True)
         if result["getProjectById"] is None:
             raise ResourceNotFoundError(
-                message="The project does not have a labeling service.")
+                message="The project does not have a labeling service data yet."
+            )
         data = result["getProjectById"]
         data["client"] = client
         return cls(**data)

libs/labelbox/src/labelbox/schema/media_type.py

@@ -54,6 +54,8 @@ def matches(value, name):
             if matches(value, name):
                 return member
 
+        return cls.Unsupported
+
     @classmethod
     def is_supported(cls, value):
         return isinstance(value,