Fix for the error message

For anyone who (after upgrading) receives the “Warning: Illegal string offset” message when displaying the quotes through the shortcode, this is the fix:

In the plugin editor, find in nice_quotes.php the following lines

	$tagoverride =  trim($atts[tagoveride]);
	$additionalclasses =  trim($atts[additionalclasses]);

and change them to:

	if(isset($atts[tagoveride])){
		$tagoverride =  trim($atts[tagoveride]);
	}
	if(isset($atts[additionalclasses])){
		$additionalclasses =  trim($atts[additionalclasses]);
	}

This validates the entries. Hope that helps someone!