From 3dc1ba04423e414ddc65e111617f42f54ff2e81d Mon Sep 17 00:00:00 2001
From: Theo Steininger <theo.steininger@ultimanet.de>
Date: Tue, 13 Jun 2017 10:16:55 +0200
Subject: [PATCH] Bugfix: ComposedOperator now uses the default_spaces
 attribute.

---
 nifty/operators/composed_operator/composed_operator.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/nifty/operators/composed_operator/composed_operator.py b/nifty/operators/composed_operator/composed_operator.py
index 66d1a744..adb80003 100644
--- a/nifty/operators/composed_operator/composed_operator.py
+++ b/nifty/operators/composed_operator/composed_operator.py
@@ -96,6 +96,8 @@ class ComposedOperator(LinearOperator):
         is not easily forecasteable what the output of an operator-call
         will look like.
         """
+        if spaces is None:
+            spaces = self.default_spaces
         return spaces
 
     # ---Mandatory properties and methods---
-- 
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