document: fix regressions at storage and node_descriptor

Since the introduction of __len__, the descriptors were broken for the
ftp module. Fix.

bzr revid: p_christ@hol.gr-20101103112605-tu6n6529mbdc18ve

1 files changed, 8 insertions, 0 deletions

diff --git a/addons/document/nodes.py b/addons/document/nodes.py
index f025b56698e..c0eef134f25 100644
--- a/addons/document/nodes.py
+++ b/addons/document/nodes.py
@@ -181,6 +181,14 @@ class node_descriptor(object):
     def __len__(self):
         return self.size()
 
+    def __nonzero__(self):
+        """ Ensure that a node_descriptor will never equal False
+        
+            Since we do define __len__ and __iter__ for us, we must avoid
+            being regarded as non-true objects.
+        """
+        return True
+
     def next(self, str):
         raise NotImplementedError