[Bug]: 搜索框内容清空，搜索内容没有被清空

[Gzzzxx]

使用的 Butterfly 版本？ | What version of Butterfly are you use?

4.14.0-b3

是否修改过主题文件？ || Has the theme files been modified?

是 (Yes)

使用的瀏覽器？ || What browse are you using?

Chrome

使用的系統？ || What operating system are you using?

Windows

依賴插件 | Package dependencies Information

+-- hexo@7.2.0
+-- hexo-algoliasearch@2.0.1
+-- hexo-generator-archive@2.0.0
+-- hexo-generator-category@2.0.0
+-- hexo-generator-index@3.0.0
+-- hexo-generator-tag@2.0.0
+-- hexo-renderer-ejs@2.0.0
+-- hexo-renderer-marked@6.3.0
+-- hexo-renderer-pug@3.0.0
+-- hexo-renderer-stylus@3.0.1
+-- hexo-server@3.0.0
`-- hexo-theme-landscape@1.0.0

問題描述 | Describe the bug

这是正常搜索时，是没问题的 当我把搜索框hello删掉，搜索内容没有被清空

出現問題網站 | Website

http://localhost:4000/

[jerryc127]

https://github.com/jerryc127/hexo-theme-butterfly/commit/06f543ed96edfd3d155ce7dd3a4a93892d35ef0f