Index: trunk/packages/invirt-base/python/invirt/common.py
===================================================================
--- trunk/packages/invirt-base/python/invirt/common.py	(revision 1934)
+++ trunk/packages/invirt-base/python/invirt/common.py	(revision 1935)
@@ -40,4 +40,6 @@
     elif type(x) == list:
         return [dicts2struct(v, newprefix(i)) for i, v in enumerate(x)]
+    elif x is None:
+        return struct({}, prefix)
     else:
         return x