added a line to evaluate to see if no filepath will print correctly

app.py

@@ -302,6 +302,9 @@ def evaluate_model(username, file):
             # print(f"HELLO: {hello}")
             # import 
             sectors_model = import_and_run_function(file, "evaluate", local_file_path)
+            if sectors_model == None:
+                return None
+            
             try:
                 os.remove(local_file_path)
             except Exception as e: