cubicweb-card #2967206 links to inexistent pages should suggest page creation [validation pending]

This is how most wikis work.

prioritynormal
typeenhancement
done in0.5.0
load1.000
load left0.000
closed by#eb63d1d287e5 Suggest card creation from URL request (closes #2967206)
patchSuggest card creation from URL request (closes #2967206) [applied]