fix(loader): correctly check if source map is undefined (#641)

Author: evilebottnawi

lib/loader.js

@@ -110,7 +110,7 @@ module.exports = function(content, map) {
 		}
 
 		var moduleJs;
-		if(query.sourceMap && result.map) {
+		if(sourceMap && result.map) {
 			// add a SourceMap
 			map = result.map;
 			if(map.sources) {
@@ -129,7 +129,7 @@ module.exports = function(content, map) {
 		// embed runtime
 		callback(null, "exports = module.exports = require(" +
 			loaderUtils.stringifyRequest(this, require.resolve("./css-base.js")) +
-			")(" + query.sourceMap + ");\n" +
+			")(" + sourceMap + ");\n" +
 			"// imports\n" +
 			importJs + "\n\n" +
 			"// module\n" +