Compatibility fix for python 2.3/2.4 to allow partially initialized formfields to be instantiated in the form without error.
Compatibility fix for python 2.3/2.4 to allow partially initialized formfields to be instantiated in the form without error.

skytreader/wtforms,Aaron1992/wtforms,Aaron1992/wtforms,pawl/wtforms,hsum/wtforms,subyraman/wtforms,wtforms/wtforms,jmagnusson/wtforms,Xender/wtforms,cklein/wtforms,crast/wtforms,pawl/wtforms