fix bug when generating raw code maps

Author: sokra

lib/SourceListMap.js

@@ -22,7 +22,7 @@ SourceListMap.prototype.add = function(generatedCode, source, originalSource) {
 	if(typeof generatedCode === "string") {
 		if(source) {
 			this.children.push(new SourceNode(generatedCode, source, originalSource));
-		} else if(this.children.length > 0 && this.children[this.children.length - 1].addGeneratedCode) {
+		} else if(this.children.length > 0 && this.children[this.children.length - 1] instanceof CodeNode) {
 			this.children[this.children.length - 1].addGeneratedCode(generatedCode);
 		} else {
 			this.children.push(new CodeNode(generatedCode));

test/mapGeneratedCode.js

@@ -1,6 +1,4 @@
 var should = require("should");
-var fs = require("fs");
-var path = require("path");
 var SourceListMap = require("../").SourceListMap;
 
 describe("mapGeneratedCode", function() {
@@ -51,9 +49,8 @@ describe("mapGeneratedCode", function() {
 			expectedPart,
 			"AAfA",
 			expectedPart,
-			"AACA",
-			expectedPart,
-			"AA/BA",
+			";;;;;;;;;;;",
+			"AAfA",
 			expectedPart
 		].join(";"));
 		result.source.should.be.eql(