I have a picklist type of field where the user selects from a set of 
predefined values. I am using IS_IN_SET(list_of_values) in the Field 
constructor.
The form cannot be saved unless a value is selected, i.e. the field is 
essentially a required field.

I would like to allow the user NOT to select a value, and still be able to 
save the form.

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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