@import url("a.css"); files get ignored

If you want to take this to the extreme make a webpage that uses this style for loading css

```

@import url("a.css");
@import url("b.css");
@import url("c.css");
@import url("d.css");
@import url("e.css");

```

When running `critical https://import.css.url.com/` it'll spit out this "Error: css should not be empty" even though css files do exist.