修复步骤添加的bug。

application/admin/view/study/plan/createsteps.php

@@ -90,7 +90,7 @@
     var id={$id}, pid={$pid}, plan=<?php echo isset($plan) ? $plan : []?>;
     var $ = layui.jquery;
     var layer = layui.layer;
-    var coursechecked = <?php echo isset($coulist) ? $coulist : '{}'?>;
+    var coursechecked = <?php echo (isset($coulist) &&  $coulist != '[]')? $coulist : '{}'?>;
     //加载列表
     require(['vue','helper','zh-cn','request','plupload','aliyun-oss','OssUpload'],function(Vue,$h) {
         new Vue({