From d2d35516d46b2fedd43486004d0115034d141836 Mon Sep 17 00:00:00 2001
From: Andreas Freise <adf@star.bham.ac.uk>
Date: Wed, 11 Dec 2013 13:46:33 +0000
Subject: [PATCH] fixing a problem with pd initialisation.

---
 pykat/detectors.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pykat/detectors.py b/pykat/detectors.py
index a99ca3d..f66dc95 100644
--- a/pykat/detectors.py
+++ b/pykat/detectors.py
@@ -97,7 +97,7 @@ class photodiode(Detector):
     def phi(self): return self.__phi
 
         
-    def __init__(self, name, node, senstype=None, num_demods=0, demods=[]):        
+    def __init__(self, name, node, senstype="", num_demods=0, demods=[]):        
         Detector.__init__(self, name, node)
         if num_demods>2:
             raise NotImplementedError("pd with more than two demodulations not implemented yet")   
-- 
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