[TD]fix potential crash if page deletes self

src/Mod/TechDraw/Gui/MDIViewPage.cpp

@@ -400,9 +400,6 @@ void MDIViewPage::onDeleteObject(const App::DocumentObject& obj)
     //if this page has a QView for this obj, delete it.
     if (obj.isDerivedFrom(TechDraw::DrawView::getClassTypeId())) {
         (void) m_view->removeQViewByName(obj.getNameInDocument());
-    } else if (m_objectName == obj.getNameInDocument()) {
-        // if obj is me, hide myself and my tab
-        m_vpPage->hide();
     }
 }