cubicweb-testcard #2089045 crash on test card referencing a ticket [validation pending]

see https://www.logilab.net/extranet/testinstance/62169

prioritynormal
typebug
done in0.4.0
load0.100
load left0.000
closed by#86e110c6a914 fix crash on test of card referencing a ticket, not directly a project. Closes #2089045