selenium tests should wait for gadgets on home page

2014-08-26 11:59:47,657 ERROR [http-apr-0.0.0.0-8080-exec-26] [org.nuxeo.opensocial.container.server.webcontent.gadgets.opensocial.OpenSocialAdapter] Unable to get gadget spec for favorites
org.apache.shindig.gadgets.GadgetException: Unable to retrieve spec for http://127.0.0.1:8080/nuxeo/site/gadgets/favorites/favorites.xml. HTTP error 504
	at org.apache.shindig.gadgets.AbstractSpecFactory.fetchFromNetwork(AbstractSpecFactory.java:119)
	at org.apache.shindig.gadgets.AbstractSpecFactory.getSpec(AbstractSpecFactory.java:89)
	at org.apache.shindig.gadgets.DefaultGadgetSpecFactory.getGadgetSpec(DefaultGadgetSpecFactory.java:80)
	at org.nuxeo.opensocial.container.server.webcontent.gadgets.opensocial.OpenSocialAdapter.getGadgetSpec(OpenSocialAdapter.java:207)
	at org.nuxeo.opensocial.container.server.webcontent.gadgets.opensocial.OpenSocialAdapter.getData(OpenSocialAdapter.java:148)
	at org.nuxeo.opensocial.container.server.webcontent.gadgets.opensocial.OpenSocialAdapter.getData(OpenSocialAdapter.java:54)
	at org.nuxeo.opensocial.container.server.webcontent.abs.AbstractWebContentDAO.read(AbstractWebContentDAO.java:49)
	at org.nuxeo.opensocial.container.server.service.WebContentSaverServiceImpl.read(WebContentSaverServiceImpl.java:42)
	at org.nuxeo.ecm.spaces.impl.docwrapper.DocSpaceImpl.readWebContents(DocSpaceImpl.java:209)
	at org.nuxeo.ecm.user.center.dashboard.UserDashboardSpaceProvider.i18nGadgets(UserDashboardSpaceProvider.java:115)
	at org.nuxeo.ecm.user.center.dashboard.UserDashboardSpaceProvider.getOrCreateSpace(UserDashboardSpaceProvider.java:94)
	at org.nuxeo.ecm.user.center.dashboard.UserDashboardSpaceProvider.doGetSpace(UserDashboardSpaceProvider.java:69)
	at org.nuxeo.ecm.spaces.api.AbstractSpaceProvider.getSpace(AbstractSpaceProvider.java:40)
	at org.nuxeo.ecm.spaces.impl.SpaceManagerImpl.getSpace(SpaceManagerImpl.java:92)