fixed layout in lack of configuration

applications/welcome/views/layout.html

@@ -94,7 +94,7 @@
         {{block center}}
         {{include}}
         {{end}}
-        {{=response.toolbar() if configuration.get('app.toolbar') else ''}}
+        {{=response.toolbar() if 'configuration' in globals() and configuration.get('app.toolbar') else ''}}
       </div>
     </div>