From c46dcb7fca280f33a23050cb275de8bb60d57037 Mon Sep 17 00:00:00 2001
From: Davis Goodin <dagood@microsoft.com>
Date: Thu, 21 Oct 2021 18:14:47 -0500
Subject: [PATCH] Fix empty SourceBuiltPrebuiltsTarballFile batch behavior

---
 src/SourceBuild/tarball/content/tools-local/init-build.proj | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/SourceBuild/tarball/content/tools-local/init-build.proj b/src/SourceBuild/tarball/content/tools-local/init-build.proj
index ee7a1bdb8..c5494dedd 100644
--- a/src/SourceBuild/tarball/content/tools-local/init-build.proj
+++ b/src/SourceBuild/tarball/content/tools-local/init-build.proj
@@ -54,7 +54,8 @@
       <SourceBuiltPrebuiltsTarballFile Include="$(ExternalTarballsDir)$(SourceBuiltPrebuiltsTarballName).*.tar.gz" />
     </ItemGroup>
     <Exec Command="tar -xzf %(SourceBuiltPrebuiltsTarballFile.FullPath)"
-          WorkingDirectory="$(PrebuiltPackagesPath)" />
+          WorkingDirectory="$(PrebuiltPackagesPath)"
+          Condition="'@(SourceBuiltPrebuiltsTarballFile)' != ''" />
 
     <!-- Move SBRP packages to reference packages location -->
     <MakeDir Directories="$(ReferencePackagesDir)" />