Assert that m_pendingEvents is not NULL (patch #886852 sort of)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@25442 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/common/event.cpp

@@ -1095,6 +1095,9 @@ void wxEvtHandler::AddPendingEvent(wxEvent& event)
 
 void wxEvtHandler::ProcessPendingEvents()
 {
+    // DE: It doesn't look like this method was intended to be called unless
+    // pending events have already been created.
+    wxASSERT_MSG(m_pendingEvents,wxT("Please call wxApp::ProcessPendingEvents() instead"));
 #if defined(__VISAGECPP__)
     wxENTER_CRIT_SECT( m_eventsLocker);
 #else