fillEmptyBlocks not working properly if a function is specified

[raz_atoth]

The function never fires,if config.fillEmptyBlocks is a function,although there are empty elements and a &nbsp; is placed instead just as if config.fillEmptyBlocks was true [<div class="block">&nbsp;</div>] If config.fillEmptyBlocks=false it works as expected [<div class="block"></div>]

config.fillEmptyBlocks = function( element )
	{
		alert('fillEmptyBlocks!');
		if ( element.attributes[ 'class' ].indexOf ( 'clear-both' ) != -1 )
			return false;
	}

[Jakub Ś]

Problem can be reproduced from CKEditor 4 beta. In 3.x branch when you switched to source you could see alert being called. Nothing like this is happening in CKE 4.x.