$(document).ready(function(){
	$('.div p').each(function(){
		$innerHtml = $(this).html();
		if($(this).html() == " " || $(this).html() == undefined || $(this).html() == ""){
			$(this).hide();
		}
	});
});

This simple snippet let's you hide unwanted strings inside paragraphs. 
I use this for text that come from javascript editors like tinymce.

Hide unwanted html that came from javascript editors (like tinymce, etc.)

jQuery