From acc64df657c12b0cfc98ce3d0a0a86a2be51744a Mon Sep 17 00:00:00 2001
From: Thomas Nagy <tnagy@waf.io>
Date: Wed, 7 Oct 2015 00:16:11 +0200
Subject: [PATCH] IronPython fix for VisualStudio detection

---
 waflib/Tools/msvc.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/waflib/Tools/msvc.py b/waflib/Tools/msvc.py
index 3bb1a9a9..1bb896f8 100644
--- a/waflib/Tools/msvc.py
+++ b/waflib/Tools/msvc.py
@@ -235,7 +235,7 @@ def gather_wsdk_versions(conf, versions):
 			path,type = Utils.winreg.QueryValueEx(msvc_version,'InstallationFolder')
 		except WindowsError:
 			continue
-		if os.path.isfile(os.path.join(path, 'bin', 'SetEnv.cmd')):
+		if path and os.path.isfile(os.path.join(path, 'bin', 'SetEnv.cmd')):
 			targets = []
 			for target,arch in all_msvc_platforms:
 				try: