A problem was introduced on commit 1383a65d000e98e2f85f703702004f400e599630, the
 validator expects than the value of fieldset is None or an integer represented
 as string. KSS uses the value of the hidden field and the value set as kssattr-fieldset classes, so the validator ends recieving values than can't converted to an integer.

Conflicts:
	CHANGES.txt