A segmentation fault occurs in uct dc mlx5 ep fence when it is called on an endpoint that does not have a…

A segmentation fault occurs in uct dc mlx5 ep fence when it is called on an endpoint that does not have a…: a task in LegoFlow-SWE (Harbor dataset). This can be reproduced by creating a DC endpoint and invoking the fence operation before any messages have been sent and before a DCI has been…