skip null objects

diff --git a/sfa/rspecs/elements/element.py b/sfa/rspecs/elements/element.py
index bc66c76..abfb7fc 100644 (file)
--- a/sfa/rspecs/elements/element.py
+++ b/sfa/rspecs/elements/element.py
@@ -47,6 +47,8 @@ class Element(dict):
             objs = [objs]
         elems = []
         for obj in objs:
+            if not obj:
+                continue
             if not fields:
                 fields = obj.keys()
             elem = xml.add_element(name)