Made EvTable handle data entries with completely empty cells. Resolves #917.
Made EvTable handle data entries with completely empty cells. Resolves #917.

ergodicbreak/evennia,titeuf87/evennia,jamesbeebop/evennia,ergodicbreak/evennia,titeuf87/evennia,shollen/evennia,jamesbeebop/evennia,feend78/evennia,ergodicbreak/evennia,jamesbeebop/evennia,feend78/evennia,shollen/evennia,titeuf87/evennia,feend78/evennia,feend78/evennia,titeuf87/evennia