cubicweb-brainomics #3896262 Allow for updating the wiki of an entity once it exists [validation pending]

Indeed, currently a new wiki is created via the "Update wiki" action.

Instead, one would like to be able to update the wiki if it exists, and to create a new wiki only if no wiki exists for the entity.

prioritynormal
typeenhancement
done in0.10.0
load0.100
load left0.000
closed by#a2379bed0164 [actions] Allow for updating the wiki of an entity if it exists instead of creating a new wiki each time (closes #3896262)
patch[actions] Allow for updating the wiki of an entity if it exists instead of creating a new wiki each time (closes #3896262) [applied]