notice error fix

themes/googleimage/views/site/index.php

@@ -1,7 +1,7 @@
 <div class="menu">
 <?php
 $selectedId = $viewData['cateId'];
-$breadcrumbs = $viewData['breadcrumbs'];
+$breadcrumbs = !empty($viewData['breadcrumbs']) ? $viewData['breadcrumbs'] : [];
 if (!empty($viewData['menus'])) {		//只显示第一级目录
 	foreach($viewData['menus'] as $index => $item) {
 		$selected = $item['id'] == $selectedId || (!empty($breadcrumbs) && $item['id'] == $breadcrumbs[0]['id']) ? 'selected' : '';