cubicweb-card #3011776 Display links to non existant wiki pages a different way [validation pending]

So that they are visually distinct from their counterpart. I chose a grey font color.

prioritynormal
typeenhancement
done in0.5.1
load0.100
load left0.000
closed by#45efecc7a7c3 Make links to non yet existing cards visually distinct from their counterpart.
patchMake links to non yet existing cards visually distinct from their counterpart. [applied]