Fixes the  searching by category. Resolves #488.
Fixes the  searching by category. Resolves #488.

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