1、修复几处bug；

2、完善内容管理中的细节功能

app/http/validate/Category.php

@@ -16,14 +16,16 @@ use think\Validate;
 class Category extends Validate{
 	protected $rule = [
 		'title'  =>  'require',
+		'model_id' => 'require'
 	];
 
 	protected $message  =   [
 		'title.require' => '栏目名称必须',
+		'model_id.require' => '绑定模型必须',
 	];
 
 	protected $scene = [
-		'adminadd'  =>  ['title'],
-		'adminedit'  =>  ['title'],
+		'adminadd'  =>  ['title', 'model_id'],
+		'adminedit'  =>  ['title', 'model_id'],
 	]; 
 }