add sloth when no address

closes #275 

HOWEVER - this doesn't really quite do what I want. If someone enters 'blah blah blah' in the address field for a group, the sloth will not show, instead it'll be a grey box. Is there a way to check whether or not the address is a real address? And if not, show the sloth? This is obviously very important.

Perhaps this is part of a larger address-validation problem...

But in the meantime... more sloths are always a good thing.