Allow modules that resolve to falsy values in tests

Author: kgram

test/helpers.js

@@ -16,7 +16,7 @@ function getEvaluated(output, modules) {
 				return require("../lib/url/escape");
 			if(module.indexOf("-!/path/css-loader!") === 0)
 				module = module.substr(19);
-			if(modules && modules[module])
+			if(modules && module in modules)
 				return modules[module];
 			return "{" + module + "}";
 		});