[fix] 修复 toolkit::Any::empty() 返回always true 问题(#263) (#265)

Author: linwenchen

src/Util/util.h

@@ -472,7 +472,7 @@ class Any {
     }
 
     operator bool() const { return _data.operator bool(); }
-    bool empty() const { return !bool(); }
+    bool empty() const { return !operator bool(); }
 
     void reset() {
         _type = nullptr;