Index: trunk/ippToPsps/jython/gpc1db.py
===================================================================
--- trunk/ippToPsps/jython/gpc1db.py	(revision 32017)
+++ trunk/ippToPsps/jython/gpc1db.py	(revision 32018)
@@ -223,5 +223,5 @@
             files = glob.glob(path + "/*.smf")
 
-        if len(files) < 1: return "NULL"
+        if len(files) < 1: return None
 
         return Fits(self.logger, self.doc, files[0]) # TODO just returning first file - check
@@ -261,5 +261,5 @@
 
         self.logger.error("Could not find stack cmf")
-        return "NULL"
+        return None
 
     '''