From 4b805c7535101f61c9ec854d011200077b38137c Mon Sep 17 00:00:00 2001
From: Sumit Arora <er.sumitarora@gmail.com>
Date: Wed, 7 Jun 2017 10:21:01 -0400
Subject: [PATCH] fix(@angular/cli): fix empty style urls

---
 packages/@ngtools/webpack/src/loader.ts       |  2 +-
 .../tests/build/styles/empty-style-urls.ts    | 24 +++++++++++++++++++
 2 files changed, 25 insertions(+), 1 deletion(-)
 create mode 100644 tests/e2e/tests/build/styles/empty-style-urls.ts

diff --git a/packages/@ngtools/webpack/src/loader.ts b/packages/@ngtools/webpack/src/loader.ts
index 5dd0c0f7ab4d..d8e52aacf171 100644
--- a/packages/@ngtools/webpack/src/loader.ts
+++ b/packages/@ngtools/webpack/src/loader.ts
@@ -361,7 +361,7 @@ function _getResourcesUrls(refactor: TypeScriptFileRefactor): string[] {
         const arr = <ts.ArrayLiteralExpression[]>(
           refactor.findAstNodes(node, ts.SyntaxKind.ArrayLiteralExpression, false));
         if (!arr || arr.length == 0 || arr[0].elements.length == 0) {
-          return;
+          return acc;
         }
 
         arr[0].elements.forEach((element: ts.Expression) => {
diff --git a/tests/e2e/tests/build/styles/empty-style-urls.ts b/tests/e2e/tests/build/styles/empty-style-urls.ts
new file mode 100644
index 000000000000..7f894371c007
--- /dev/null
+++ b/tests/e2e/tests/build/styles/empty-style-urls.ts
@@ -0,0 +1,24 @@
+import { writeMultipleFiles } from '../../../utils/fs';
+import { ng } from '../../../utils/process';
+
+
+export default function () {
+
+  return Promise.resolve()
+    // Write assets.
+    .then(_ => writeMultipleFiles({
+      './src/app/app.component.ts': `
+        import { Component } from '@angular/core';
+
+        @Component({
+          selector: 'app-root',
+          templateUrl: './app.component.html',
+          styleUrls: []
+        })
+        export class AppComponent {
+          title = 'app';
+        }
+      `
+    }))
+    .then(() => ng('build'));
+}