Changed the datamapper orm so that the default value is only deleted when it is nill, this is so that is a value is set to another value except nil by default through devise, that value will be maintained in datamapper
Changed the datamapper orm so that the default value is only deleted when it is nill, this is so that is a value is set to another value except nil by default through devise, that value will be maintained in datamapper

Signed-off-by: José Valim <0c2436ea76ed86e37cc05f66dea18d48ef390882@gmail.com>

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zybee83/devise,kewaunited/devise,silvaelton/devise,Bazay/devise