removing sourcemap if not needed

Author: shekhei

lib/processCss.js

@@ -167,17 +167,20 @@ module.exports = function processCss(inputSource, inputMap, options) {
 		}));
 	}
 
-	var result = pipeline.process(inputSource, {
+    var opts = {
 		from: options.from,
-		to: options.to,
-		map: {
+		to: options.to
+    }
+    if ( query.sourcemap ) {
+		opts.map = {
 			prev: inputMap,
 			sourcesContent: true,
 			inline: false,
 			annotation: false
 		}
-	});
 
+    }
+	var result = pipeline.process(inputSource, opts);
 
 	return {
 		source: result.css,