Hi,

I have no error message when I wrongly fill a list with spaces / special 
characters.
However the validator works, as I need to respect it to update the record.

db.define_table('parameter',
    Field('allowed_users', type='list:string'),
    )
db.parameter.allowed_users.requires = IS_LIST_OF(IS_ALPHANUMERIC())

# I first inserted a row with the default DB administration tool. But no 
error message also there. 

form = crud.update(db.parameter, 1, deletable=False)

I did try quite everything already :
- Redefining error_message at the IS_ALPHANUMERIC level or at the IS_LISTOF.
- defining the validator at the table level
- Removing the "IS_LIST_OF"..

But no success, it 's validating, but no error message displayed. This then 
becomes quite unusable.

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