From a7befd678325f28b5682af5ae2edfc7b80491089 Mon Sep 17 00:00:00 2001
From: Lindsey Heagy <lindseyheagy@gmail.com>
Date: Thu, 21 Jul 2016 12:38:21 -0700
Subject: [PATCH] fix typo in cell grad

---
 SimPEG/Mesh/DiffOperators.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/SimPEG/Mesh/DiffOperators.py b/SimPEG/Mesh/DiffOperators.py
index 54db6ad5..f7a13580 100644
--- a/SimPEG/Mesh/DiffOperators.py
+++ b/SimPEG/Mesh/DiffOperators.py
@@ -323,7 +323,7 @@ class DiffOperators(object):
         """
         The cell centered Gradient, takes you to cell faces.
         """
-        if(self._cellGrad is None):
+        if getattr(self, '_cellGrad', None) is None:
             G = self._cellGradStencil()
             S = self.area  # Compute areas of cell faces & volumes
             V = self.aveCC2F*self.vol  # Average volume between adjacent cells