messages are awkward for formencode.validators.NotEmpty

i don't know if this is because docs or a changing config, but...

- i created a formencode.validators.NotEmpty instance
- i kept getting "Missing Value" errors that i needed to customize
- the class itself has this:

     messages = {
         'empty': _("Please enter a value"),
         }

which didn't make since, because I wasn't getting that error.

so i tried
	is_tos= formencode.validators.NotEmpty( messages={ 'empty': 'You  
must check this box to register' })

that didn't work.

searching all of Formencode, i got the idea to try this:
         is_tos= formencode.validators.NotEmpty( messages={ 'empty':  
'You must check this box to register.', 'missingValue': 'You must  
check this box to register..' } )

that didn't work either.

looking at the changelog, i finally figured out how to customize that  
error:
         is_tos= formencode.validators.NotEmpty( messages={ 'empty':  
'You must check this box to register.', 'missingValue': 'You must  
check this box to register..' , 'missing': 'You must check this box  
to register...' } )

it would be nice if things were a bit more straightforward.

is the empty ever called for the NotEmpty ?  should that just be  
'missing' ?

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