Doc webdav: fix typo in case of exception.

If user rights are not setup for the user that connects to WebDAV, this
exception will occur and the typo would not help debug the problem.
(still, the user won't see the items at either case)

bzr revid: p_christ@hol.gr-20101014110323-zxj5oha0u96e2l1t

addons/document_webdav/dav_fs.py

@@ -339,7 +339,7 @@ class openerp_dav_handler(dav_interface):
                         result.append( self.urijoin(dbname,d.path) )
         except DAV_Error:
             raise
-        except Exception:
+        except Exception, e:
             self.parent.log_error("cannot get_childs: "+ str(e))
             raise
         finally: