From 3ad11dc0c7619ac067995c0896ef76d72ebbf0c0 Mon Sep 17 00:00:00 2001
From: David Vierra <codewarrior@hawaii.rr.com>
Date: Sun, 10 Jan 2016 22:53:41 -1000
Subject: [PATCH] Assert display list is not None instead of is not truthy.

bool(array[0]) is not truthy but is still a valid display list.
---
 src/mcedit2/util/glutils.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/mcedit2/util/glutils.py b/src/mcedit2/util/glutils.py
index 0f16fd7..c2e4e45 100644
--- a/src/mcedit2/util/glutils.py
+++ b/src/mcedit2/util/glutils.py
@@ -162,7 +162,7 @@ class DisplayList(object):
         return self._list
 
     def call(self):
-        assert self._list
+        assert self._list is not None
         GL.glCallLists(self._list)