From ebda31df0aca6216dba4fa3f72dcd8f8afafc438 Mon Sep 17 00:00:00 2001
From: Rob Reynolds <ferventcoder@gmail.com>
Date: Thu, 5 May 2016 18:37:50 -0500
Subject: [PATCH] (GH-724) Set Env Vars to empty should remove vars

Removing environment variables sets empty environment variables. This
is related to the changes for GH-303.

So determine if the value is null or empty, and perform the older
behavior.
---
 .../helpers/functions/Set-EnvironmentVariable.ps1             | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/chocolatey.resources/helpers/functions/Set-EnvironmentVariable.ps1 b/src/chocolatey.resources/helpers/functions/Set-EnvironmentVariable.ps1
index 9fefb52cf5..84106ff364 100644
--- a/src/chocolatey.resources/helpers/functions/Set-EnvironmentVariable.ps1
+++ b/src/chocolatey.resources/helpers/functions/Set-EnvironmentVariable.ps1
@@ -15,8 +15,8 @@
 function Set-EnvironmentVariable([string] $Name, [string] $Value, [System.EnvironmentVariableTarget] $Scope) {
 	Write-Debug "Calling Set-EnvironmentVariable with `$Name = '$Name', `$Value = '$Value', `$Scope = '$Scope'"
 
-  if ($Scope -eq [System.EnvironmentVariableTarget]::Process) {
-    return [Environment]::SetEnvironmentVariable($Name, $Value, $Scope)
+  if ($Scope -eq [System.EnvironmentVariableTarget]::Process -or $Value -eq $null -or $Value -eq '') {
+    return [Environment]::SetEnvironmentVariable($Name, $Value, $Scope)
   }
 
   [string]$keyHive = 'HKEY_LOCAL_MACHINE'