Fix empty user display name and bio setting
Fix empty user display name and bio setting

Avoid accidental storage of "None" string into the database.

Addendum to 60ddfc57f9fd1a8219b76150ca56f1d0d0dff0d2.

alkadis/vcv,phihag/adhocracy,SysTheron/adhocracy,alkadis/vcv,SysTheron/adhocracy,phihag/adhocracy,DanielNeugebauer/adhocracy,phihag/adhocracy,liqd/adhocracy,alkadis/vcv,DanielNeugebauer/adhocracy,phihag/adhocracy,DanielNeugebauer/adhocracy,DanielNeugebauer/adhocracy,liqd/adhocracy,phihag/adhocracy,liqd/adhocracy,alkadis/vcv,alkadis/vcv,liqd/adhocracy,SysTheron/adhocracy,DanielNeugebauer/adhocracy