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Scoped variables cause an error when sort-order is enabled

See original GitHub issue

.form {
    $foo: #fff;
    $bar: #fff;
}

Produces:

TypeError: a.match is not a function
    at sortLeftovers (/Users/gajus/Documents/dev/gajus/pragmatist/node_modules/csscomb/lib/options/sort-order.js:244:19)
    at /Users/gajus/Documents/dev/gajus/pragmatist/node_modules/csscomb/lib/options/sort-order.js:334:24
    at Array.sort (native)
    at module.exports.process (/Users/gajus/Documents/dev/gajus/pragmatist/node_modules/csscomb/lib/options/sort-order.js:325:16)
    at Object.Node.map (/Users/gajus/Documents/dev/gajus/pragmatist/node_modules/gonzales-pe/lib/node.js:111:9)
    at /Users/gajus/Documents/dev/gajus/pragmatist/node_modules/gonzales-pe/lib/node.js:117:22
    at Array.forEach (native)
    at Object.Node.map (/Users/gajus/Documents/dev/gajus/pragmatist/node_modules/gonzales-pe/lib/node.js:115:22)
    at /Users/gajus/Documents/dev/gajus/pragmatist/node_modules/gonzales-pe/lib/node.js:117:22
    at Array.forEach (native)
    at Object.Node.map (/Users/gajus/Documents/dev/gajus/pragmatist/node_modules/gonzales-pe/lib/node.js:115:22)
    at /Users/gajus/Documents/dev/gajus/pragmatist/node_modules/csscomb-core/lib/core.js:132:18
    at Array.forEach (native)
    at Object.processTree (/Users/gajus/Documents/dev/gajus/pragmatist/node_modules/csscomb-core/lib/core.js:131:19)
    at processString (/Users/gajus/Documents/dev/gajus/pragmatist/node_modules/csscomb-core/lib/core.js:523:22)
    at /Users/gajus/Documents/dev/gajus/pragmatist/node_modules/csscomb-core/lib/core.js:449:38

I did a bit of debugging:

This is sortLeftovers function from sort-order.js that triggers the error.

var sortLeftovers = function(a, b) {
    var prefixes = ['-webkit-', '-moz-', '-ms-', '-o-', ''];
    var prefixesRegExp = /^(-webkit-|-moz-|-ms-|-o-)(.*)$/;

    // Get property name (i.e. `color`, `-o-animation`):
    a = a.node.get(0).get(0).content;
    b = b.node.get(0).get(0).content;


    console.log(a, b);

The output of console.log is:

[ { type: 'ident', content: 'foo', start: { line: 2, column: 6 } } ]
[ { type: 'ident', content: 'bar', start: { line: 3, column: 6 } } ]

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