Fix for Singleton AppsView.Presenter in PipelineViewPresenter.

This fix assumes that the Singleton AppsView.Presenter stores will already have loaded from the services before the PipelineViewPresenter is called, which is currently the case and a TreeStore assertion exception was getting thrown.
Calling the AppsView.Presenter::go(AppsView) method will not attempt to load the stores again from the services.
The Singleton AppsView.Presenter was added in commit 20b95ad9250be0b51477994201d9dea795b70abb.