allow view parameters for view names as node attributes to make views more selective

git-svn-id: svn://svn.cy55.de/Zope3/src/loops/trunk@2460 fd906abe-77d9-0310-91a1-e0d9ade77398

browser/node.py

@@ -111,7 +111,7 @@ class NodeView(BaseView):
     @Lazy
     def view(self):
         name = self.request.get('loops.viewName', '') or self.context.viewName
-        if '?' in name:
+        if name and '?' in name:
             name, params = name.split('?', 1)
             ann = self.request.annotations.get('loops.view', {})
             ann['params'] = params