Set serial to None after disconnecting.
Set serial to None after disconnecting.

kwagyeman/openmv,openmv/openmv,kwagyeman/openmv,openmv/openmv,openmv/openmv,iabdalkader/openmv,kwagyeman/openmv,iabdalkader/openmv,iabdalkader/openmv,openmv/openmv,iabdalkader/openmv,kwagyeman/openmv