if we run into trouble instanciating the class, print it out

and continue.. otherwise we would end up w/ an unorder, incomplete
container..

[git-p4: depot-paths = "//depot/": change = 1346]

ContentDirectory.py

@@ -114,7 +114,13 @@ class ContentDirectoryControl(UPnPPublisher, dict):
 		'''If the generated object (by klass) has an attribute content, it is installed into the web server.'''
 		assert isinstance(self[parent], Container)
 		nid = self.getnextID()
-		i = klass(self, nid, parent, title, *args, **kwargs)
+		try:
+			i = klass(self, nid, parent, title, *args, **kwargs)
+		except:
+			import traceback
+			traceback.print_exc()
+			return
+
 		if hasattr(i, 'content'):
 			self.webbase.putChild(nid, i.content)
 		#log.msg('children:', `self.children[parent]`, `i`)