Index: ../trunk-jpl/src/m/miscellaneous/fielddisplay.py
===================================================================
--- ../trunk-jpl/src/m/miscellaneous/fielddisplay.py	(revision 13964)
+++ ../trunk-jpl/src/m/miscellaneous/fielddisplay.py	(revision 13965)
@@ -50,6 +50,10 @@
 	elif isinstance(field,(list,tuple)):
 		string=list_display(offset,name,field,comment)
 
+	#None
+	elif field is None:
+		string=displayunit(offset,name,"None",comment)
+
 	else:
 		string=displayunit(offset,name,"not displayed",comment)