Create discreet widget - only shows if not empty

functions.php

//add discreet text widget
add_action('widgets_init', 'custom_discreet_text_widget');

function custom_discreet_text_widget() {
			class DiscreetTextWidget extends WP_Widget_Text {
				function DiscreetTextWidget() {
					$widget_ops = array('classname' => 'discreet_text_widget', 'description' => __('Arbitrary text or HTML, only shown if not empty'));
					$control_ops = array('width' => 400, 'height' => 350);
					$this->WP_Widget('discrete_text', __('Discreet Text'), $widget_ops, $control_ops);
				}

function widget( $args, $instance ) {
					extract($args, EXTR_SKIP);
					$text = apply_filters( 'widget_text', $instance['text'] );
					if (empty($text)) return;
					$title = apply_filters('widget_title', empty($instance['title']) ? '' : $instance['title']);
					echo $before_widget;
					if (!empty($title)) { echo $before_title.$title.$after_title;} ?>
						<div class="textwidget"><?php echo $instance['filter'] ? wpautop($text) : $text; ?></div>
					<?php
					echo $after_widget;
				}
			}
			return register_widget("DiscreetTextWidget");
		}