Fix for empty character sets
Fix for empty character sets

Filtering away characters who's type is None, to avoid tracebacks in the
event of a characterless guest.

feend78/evennia,jamesbeebop/evennia,ergodicbreak/evennia,titeuf87/evennia,titeuf87/evennia,shollen/evennia,feend78/evennia,mrkulk/text-world,emergebtc/evennia,jamesbeebop/evennia,ergodicbreak/evennia,feend78/evennia,TheTypoMaster/evennia,jamesbeebop/evennia,shollen/evennia,ergodicbreak/evennia,feend78/evennia,ypwalter/evennia,TheTypoMaster/evennia,mrkulk/text-world,TheTypoMaster/evennia,mrkulk/text-world,emergebtc/evennia,mrkulk/text-world,titeuf87/evennia,titeuf87/evennia,emergebtc/evennia,ypwalter/evennia,ypwalter/evennia