Remove allow_blank from QuerySelectMultipleField
Remove allow_blank from QuerySelectMultipleField

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