From 8802ccf18e40a09c35da45cc8b28e60bf53d31e4 Mon Sep 17 00:00:00 2001
From: "Sterling M. Harper" <sterlingmharper@gmail.com>
Date: Fri, 24 Apr 2015 19:13:22 -0400
Subject: [PATCH] Fixed void material for Python API

---
 src/utils/openmc/universe.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/utils/openmc/universe.py b/src/utils/openmc/universe.py
index e3280b3e3d..419d3bd10b 100644
--- a/src/utils/openmc/universe.py
+++ b/src/utils/openmc/universe.py
@@ -345,6 +345,9 @@ class Cell(object):
             element.set("fill", str(self._fill._id))
             self._fill.create_xml_subelement(xml_element)
 
+        elif self._fill == "void":
+            element.set("material", "void")
+
         else:
             element.set("fill", str(self._fill))
             self._fill.create_xml_subelement(xml_element)