From fc7b770ba9a7a7d4f7a40737889dd87b235559d6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Johannes=20Sch=C3=B6nberger?= <jsch@demuc.de>
Date: Tue, 3 Dec 2013 11:24:39 +0100
Subject: [PATCH] Use None as default for estimated params

---
 skimage/transform/_geometric.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/skimage/transform/_geometric.py b/skimage/transform/_geometric.py
index 611f9ab2..3e4f50f8 100644
--- a/skimage/transform/_geometric.py
+++ b/skimage/transform/_geometric.py
@@ -361,8 +361,8 @@ class PiecewiseAffineTransform(GeometricTransform):
     def __init__(self):
         self._tesselation = None
         self._inverse_tesselation = None
-        self.affines_ = []
-        self.inverse_affines_ = []
+        self.affines_ = None
+        self.inverse_affines_ = None
 
     @property
     def affines(self):