Description of problem:
When clicking on a link here:

http://jon06.mw.lab.eng.bos.redhat.com:7080/coregui/#Inventory/Groups/DynagroupDefinitions



Version-Release number of selected component (if applicable):
Ian's perf env

How reproducible:
2 out of 3 times so far

Steps to Reproduce:
1. Create dynagroup
2. View the lists of groups generated
3. Go back and try to view the dynagroup definition
  
Actual results:
In the message center you see this:
com.google.gwt.core.client.JavaScriptException:(TypeError): Cannot call method 'markForRedraw__V' of null
--- STACK TRACE FOLLOWS ---
(TypeError): Cannot call method 'markForRedraw__V' of null
    at Unknown.anonymous(Unknown source:0)
    at Unknown.at org_rhq_enterprise_gui_coregui_client_CoreGUI$RootCanvas_$renderView__Lorg_rhq_enterprise_gui_coregui_client_CoreGUI$RootCanvas_2Lorg_rhq_enterprise_gui_coregui_client_ViewPath_2V(Unknown source:0)
    at Unknown.at Object.org_rhq_enterprise_gui_coregui_client_CoreGUI_onValueChange__Lcom_google_gwt_event_logical_shared_ValueChangeEvent_2V [as onValueChange__Lcom_google_gwt_event_logical_shared_ValueChangeEvent_2V](Unknown source:0)
    at Unknown.at Object.com_google_gwt_event_logical_shared_ValueChangeEvent_dispatch__Lcom_google_gwt_event_shared_EventHandler_2V [as dispatch__Lcom_google_gwt_event_shared_EventHandler_2V](Unknown source:0)
    at Unknown.at com_google_gwt_event_shared_HandlerManager$HandlerRegistry_$fireEvent__Lcom_google_gwt_event_shared_HandlerManager$HandlerRegistry_2Lcom_google_gwt_event_shared_GwtEvent_2ZV(Unknown source:0)
    at Unknown.at com_google_gwt_event_shared_HandlerManager_$fireEvent__Lcom_google_gwt_event_shared_HandlerManager_2Lcom_google_gwt_event_shared_GwtEvent_2V(Unknown source:0)
    at Unknown.at Object.com_google_gwt_user_client_impl_HistoryImpl_fireEvent__Lcom_google_gwt_event_shared_GwtEvent_2V [as fireEvent__Lcom_google_gwt_event_shared_GwtEvent_2V](Unknown source:0)
    at Unknown.at com_google_gwt_event_logical_shared_ValueChangeEvent_fire__Lcom_google_gwt_event_logical_shared_HasValueChangeHandlers_2Ljava_lang_Object_2V(Unknown source:0)
    at Unknown.at Object.com_google_gwt_user_client_impl_HistoryImpl_newItemOnEvent__Ljava_lang_String_2V [as newItemOnEvent__Ljava_lang_String_2V](Unknown source:0)
    at Unknown.anonymous(Unknown source:0)
    at Unknown.at com_google_gwt_core_client_impl_Impl_entry0__Ljava_lang_Object_2Ljava_lang_Object_2Ljava_lang_Object_2Ljava_lang_Object_2(Unknown source:0)


Expected results:
View the dynagroup definition

Additional info: