Adding a crash guard for when a command resend timeout occurs with an empty command queue.
Adding a crash guard for when a command resend timeout occurs with an empty command queue.

ethz-asl/qgc_asl,Hunter522/qgroundcontrol,ethz-asl/qgc_asl,Hunter522/qgroundcontrol,Hunter522/qgroundcontrol,ethz-asl/qgc_asl,Hunter522/qgroundcontrol,Hunter522/qgroundcontrol,ethz-asl/qgc_asl,Hunter522/qgroundcontrol,ethz-asl/qgc_asl