allow clearing a group containing an AgGrid

nicegui/elements/group.py

@@ -23,7 +23,8 @@ class Group(Element):
 
     def clear(self):
         def collect_components(view: jp.HTMLBaseComponent) -> List[jp.HTMLBaseComponent]:
-            return view.components + [view for child in view.components for view in collect_components(child)]
+            children = getattr(view, 'components', [])
+            return children + [view for child in children for view in collect_components(child)]
         components = collect_components(self.view)
 
         active_links[:] = [