Parser fails when using Liquid in scss files

[ramya-rao-a]

Downstream issue in VS Code: microsoft/vscode#51867
See Using Liquid in Sass files

@sergeche

I tried to parse the below content by adding it to one of the test cases at https://github.com/emmetio/css-parser/blob/master/test/parse.js

.foo {
    font-size: 10px;
    color: {{ settings.was_price_color }};
}

When encountering the {{, it fails at https://github.com/emmetio/css-parser/blob/master/index.js#L75 as the tokens array is empty