errors ( fix)

this script was throwing a bunch of errors in debug mode when attributes were not set/used. solved it by adding some isset ternary to the code:

$attr['autoHeight'] = isset($atts['autoheight']) ? self::eval_bool( $atts['autoheight'] ):'';
$attr['disabled'] = isset($atts['disabled']) ? self::eval_bool( $atts['disabled'] ):'';
$attr['active'] = isset($atts['active']) ? (int)$atts['active']:'';
$attr['clearStyle'] = isset($atts['clearstyle']) ? self::eval_bool( $atts['clearstyle']):'';
$attr['collapsible']= isset($atts['collapsible']) ? self::eval_bool( $atts['collapsible']):'';
$attr['fillSpace'] = isset($atts['fillspace']) ? self::eval_bool( $atts['fillspace']):'';

http://wordpress.org/extend/plugins/accordion-shortcode/