修复几处notice报错

convention.php

@@ -56,6 +56,14 @@ return [
     'show_error_msg'        => false,
     //默认输出类型
     'default_return_type'   => 'html',
+    //默认语言
+    'default_lang'          => 'zh-cn', 
+    //是否使用session
+    'use_session'           => true,
+    //url地址的后缀
+    'url_deny_suffix'       => '',
+    //是否必须使用路由
+    'url_route_must'        => false,
 
     'log'                   => [
         'type' => 'File',

library/think/lang.php

@@ -53,6 +53,9 @@ class Lang
         $range = $range ? $range : self::$range;
         $lang  = is_file($file) ? include $file : [];
         // 批量定义
+        if(!isset(self::$lang[$range])) {
+            self::$lang[$range] = [];
+        }
         return self::$lang[$range] = array_merge(self::$lang[$range], array_change_key_case($lang));
     }
 

library/think/route.php

@@ -327,7 +327,7 @@ class Route
     /**
      * 检查正则路由
      */
-    private function checkRegex($route, $url, $matches)
+    private static function checkRegex($route, $url, $matches)
     {
         // 正则路由
         if ($route instanceof \Closure) {
@@ -341,7 +341,7 @@ class Route
     /**
      * 检查规则路由
      */
-    private function checkRule($rule, $route, $url, $pattern)
+    private static function checkRule($rule, $route, $url, $pattern)
     {
         $len1 = substr_count($url, '/');
         $len2 = substr_count($rule, '/');