bug fixed

Author: ymh199478

projects/CatLib.API/Config/Internal/ConfigExtend.cs

@@ -42,7 +42,7 @@ public static class ConfigExtend
  /// <param name="type">配置的类型</param>
  /// <param name="def">默认值</param>
  /// <returns></returns>
- public static object SafeGet(this IConfig config, string name, Type type, object def = null)
+ public static object SafeGet(this IConfig config, string name, Type type, object def)
  {
  return config == null ? def : config.Get(name, type, def);
  }