Fix VM connect element test

runtime/observatory/lib/src/elements/vm_connect.dart

Index: runtime/observatory/lib/src/elements/vm_connect.dart
diff --git a/runtime/observatory/lib/src/elements/vm_connect.dart b/runtime/observatory/lib/src/elements/vm_connect.dart
index 31afe384a88e8a4eb4490de896308516574b077c..49282a5e75680b921620868e4c98e5028657aa1a 100644
--- a/runtime/observatory/lib/src/elements/vm_connect.dart
+++ b/runtime/observatory/lib/src/elements/vm_connect.dart
@@ -98,7 +98,8 @@ class VMConnectElement extends HtmlElement implements Renderable {
                     ..children = _targets.list().map((target) {
                       final ObservatoryApplication app =
                           ObservatoryApplication.app;
-                      final bool current = app.isConnectedVMTarget(target);
+                      final bool current = (app != null) ? 
+                          app.isConnectedVMTarget(target) : false;
                       return new LIElement()
                         ..children = [
                           new VMConnectTargetElement(target,