From 72873a1bd4b731a219cebdf214204dd63cea66a0 Mon Sep 17 00:00:00 2001
From: Dmitri Bogomolov <4glitch@gmail.com>
Date: Sun, 22 Jul 2018 14:48:08 +0300
Subject: [PATCH] Prevent KeyError in checkdeps if detectOS() returns None

---
 checkdeps.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/checkdeps.py b/checkdeps.py
index 28b1e559..c0e10051 100755
--- a/checkdeps.py
+++ b/checkdeps.py
@@ -137,6 +137,8 @@ if prereqs:
 OPSYS = detectOS()
 CMD = PACKAGE_MANAGER[OPSYS] if OPSYS in PACKAGE_MANAGER else 'UNKNOWN_INSTALLER'
 for lhs, rhs in EXTRAS_REQUIRE.items():
+    if OPSYS is None:
+        break
     if rhs and any([
         EXTRAS_REQUIRE_DEPS[x][OPSYS]
         for x in rhs