Error if importer returns empty content

[GendelfLugansk]

This code leads to compilation error:

var sass = new Sass();
    sass.importer(function (request, done) {
        console.log(request);
        done({content: ''});
    });

While this works just fine:

var sass = new Sass();
    sass.importer(function (request, done) {
        console.log(request);
        done({content: '.some {}'});
    });

I think that empty string should work too

[rodneyrehm]

fixed in v0.9.13