From 6defe2e86a3d65f8f883669589442d21239e4981 Mon Sep 17 00:00:00 2001
From: Andreas Kloeckner <inform@tiker.net>
Date: Mon, 19 Oct 2015 00:23:58 -0500
Subject: [PATCH] Fix is_volume_where

---
 grudge/discretization.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/grudge/discretization.py b/grudge/discretization.py
index 7fb4562d..300b5fbc 100644
--- a/grudge/discretization.py
+++ b/grudge/discretization.py
@@ -91,7 +91,9 @@ class Discretization(object):
 
     def is_volume_where(self, where):
         from grudge import sym
-        return where == sym.VTAG_ALL
+        return (
+                where is None
+                or where == sym.VTAG_ALL)
 
 
 # vim: foldmethod=marker
-- 
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