fix: non passare argomenti vuoti a tool senza parametri

ollama_agent.py

@@ -342,7 +342,12 @@ For other questions, just answer normally without tools."""
         
         try:
             tool = self.tools[tool_call.name]
-            result = tool.invoke(tool_call.arguments)
+            
+            # Per tool senza argomenti, non passare arguments
+            if tool_call.arguments:
+                result = tool.invoke(tool_call.arguments)
+            else:
+                result = tool.invoke({})
             
             # Converti result in stringa per il modello
             if result is None:
@@ -403,10 +408,8 @@ For other questions, just answer normally without tools."""
         
         # Try to detect intent directly first
         detected_tool = self._detect_intent(user_content)
-        print(f"DEBUG: user_content='{user_content}', detected={detected_tool}")
         if detected_tool:
             result = self._execute_tool(detected_tool)
-            print(f"DEBUG: result={result}")
             
             # Format result as a clean response
             response_text = ""
@@ -427,7 +430,6 @@ For other questions, just answer normally without tools."""
             except Exception as e:
                 response_text = str(result) if not response_text else response_text
             
-            print(f"DEBUG: response_text={response_text}")
             return {"messages": self.messages, "response": response_text}
         
         # Loop principale: risposta -> parse tools -> esegui -> ripeti