Task final state is not updated in Sample View page (queue)

Created by: mguijarr

Once a task is executed, it turns "blue" ; however, the final state is not properly reported in the queue. It should be "green" if successful, or "red" (light red) if an error occurred.

With PR #385, the internal state on the server seems to be updated, because reloading the client shows executed tasks as "green". However, it is always green (even if the task could not be performed, or had an error). With current master, the task state does not seem to be reported at all ; I guess it is missing a signal somehow.