I got a run time error today:

Runtime Error: No security definition has been found for the request.
Origin: IBPlaceOrder: SBC (STK SBC USD Smart)
Stack Trace: System.Exception: No security definition has been found for the request.
Origin: IBPlaceOrder: SBC (STK SBC USD Smart)

Could Quantconnect just catch the exception and gracefully ignore it? It might happen sometimes you place an order with a symbol that doesn't exist any more.