From 1775d590ceff4cb9e46f45771a8419f56fc50103 Mon Sep 17 00:00:00 2001
From: PetSerAl <PetSerAl@gmail.com>
Date: Mon, 2 Jul 2018 20:41:03 +0300
Subject: [PATCH] Build: Fix a check to avoid null argument in case
 'vcvarsall.bat' is absent (#7218)

---
 build.psm1 | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/build.psm1 b/build.psm1
index a4b5bcd..b988f58 100644
--- a/build.psm1
+++ b/build.psm1
@@ -261,7 +261,7 @@ function Start-BuildNativeWindowsBinaries {
         $vcvarsallbatPath = $vcvarsallbatPathVS2017
     }
 
-    if ((Test-Path -Path $vcvarsallbatPath) -eq $false) {
+    if ([string]::IsNullOrEmpty($vcvarsallbatPath) -or (Test-Path -Path $vcvarsallbatPath) -eq $false) {
         throw "Could not find Visual Studio vcvarsall.bat at $vcvarsallbatPath. Please ensure the optional feature 'Common Tools for Visual C++' is installed."
     }