From 8d5c2540ea37ecc1e603772c643df6351d89cfad Mon Sep 17 00:00:00 2001
From: Jason Simmons <jason-simmons@users.noreply.github.com>
Date: Tue, 9 Aug 2016 15:50:17 -0700
Subject: [PATCH] Create an empty zip file in ZipToolBuilder if the entry list
 is empty (#5311)

This can happen if you build an FLX in release mode for an app with no assets
(such as the hello_world example)
---
 packages/flutter_tools/lib/src/zip.dart | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/packages/flutter_tools/lib/src/zip.dart b/packages/flutter_tools/lib/src/zip.dart
index 1c7b79b9f30..9231aedbf5c 100644
--- a/packages/flutter_tools/lib/src/zip.dart
+++ b/packages/flutter_tools/lib/src/zip.dart
@@ -50,6 +50,13 @@ class _ZipToolBuilder extends ZipBuilder {
 
   @override
   void createZip(File outFile, Directory zipBuildDir) {
+    // If there are no assets, then create an empty zip file.
+    if (entries.isEmpty) {
+      List<int> zipData = new ZipEncoder().encode(new Archive());
+      outFile.writeAsBytesSync(zipData);
+      return;
+    }
+
     if (outFile.existsSync())
       outFile.deleteSync();