cubicweb #343724 bad absolute_url if rest attr has an empty value [resolved]

for instance with a card with a wikiid set to an empty string, generated url looks like 'http://testing.fr/cubicweb/card/' which is obviously wrong (show all cards)

prioritynormal
typebug
done in3.3.1
load0.100
load left0.000
closed by<not specified>