Problems in code blocks with blank lines

[li-xin-yi]

I notice that code blocks will automatically leave out blank lines in source code, but line numbers of those lines still remain. It looks like

But I want something like

So I try to fix it by adding

.highlight .line{
  height: /*some fixed value*/ ; 
}

to hexo-theme-bootstrap-blog/source/css/highlight-js.css

It just works. But sorry for my ignorance of programming, I hope you the author can help me figure out a more reliable solution. Thanks 🙏