Add connection state verification in command execution

- Check serial connection status before sending commands
- Prevent command execution on closed or inactive connections
- Add informative log message when connection is lost
- Enhance robustness of command sending mechanism

ComConfigCopy.py

@@ -633,6 +633,12 @@ def send_command_and_process_response(
 ):
     attempt = 0
     while attempt < max_attempts:
+        # Проверяем, что соединение всё ещё активно
+        if not serial_connection or not serial_connection.is_open:
+            if log_callback:
+                log_callback("[INFO] Соединение закрыто.\n")
+            return False, None
+            
         msg = f"\nОтправка команды: {cmd}\n"
         if log_callback:
             log_callback(msg)