RatioBarChart: Remove unnecessary check

It's already (better) handled by BarChart

js/components/RatioBarChart.js

@@ -5,14 +5,13 @@ var BarChart = require('../components/BarChart')
 module.exports = React.createClass({
 	displayName: "RatioBarChart",
 	render: function() {
-		/* Expects 'this.props.numerator' and '.denominator' to be in the form:
+		/* Expects 'this.props.numerator' and 'this.props.denominator' to be in
+		 * the form:
 		 * [
 		 * 	{'Label': 'foo', 'Value': 1.4},
 		 * 	{'Label': 'bar', 'Value': 8}
 		 * ]
 		 */
-		if (this.props.denominator.length < 1)
-			return (<div />);
 
 		var numeratorMap = {};
 		for (var i = 0; i < this.props.numerator.length; i++) {