Nowadays I mostly use web2py's code as my documentation so I simply looked 
at the code for IS_EMPTY_OR in:

https://github.com/web2py/web2py/blob/master/gluon/validators.py

Of course I already suspected the problem was there which just comes from 
experience using and developing web2py.

-- 
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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