cubicweb-cmt #1765191 wrong message in registration box [validation pending]

If user was registered for a conference in the past, the box says "you are registered". Check that the registration is for the future and open conference.

prioritynormal
typebug
done in0.4.0
load left0.000
closed by#e8828ef8c54c [views] fix wrong message in registration box (closes #1765191)