Fix: Fallback handling for empty JSON extraction in backend manager

backend/services/tinytroupe_manager.py

@@ -136,7 +136,8 @@ class TinyTroupeSimulationManager:
                     )
                     
                     # Safe parsing fallback
-                    if extracted_data is None:
+                    if extracted_data is None or type(extracted_data) is not dict:
+                        extracted_data = {}
                         extracted_data = {}
                         
                     parsed_response = {