unset any stream that might be left over from earlier specs

spec/javascripts/app/views/bookmarklet_view_spec.js

@@ -16,6 +16,7 @@ describe('app.views.Bookmarklet', function() {
   };
 
   beforeEach(function() {
+    app.stream = null;  // avoid rendering posts
     loginAs({name: "alice", avatar : {small : "http://avatar.com/photo.jpg"}});
     spec.loadFixture('bookmarklet');
   });