Checkmk Werk 12038: Fix displaying host graphs on dashboard

ID: 12038 Title: Fix displaying host graphs on dashboard Component: Multisite Level: 1 Class: Bug fix Version: 2.1.0i1 Previous 2.0.0 versions could not display host related time series graphs on the dashboard. The new context validation mechanism, that expects a service context for this dashlet, was preventing the rendering of that dashlet. Now the host dashlets automatically get an empty service context set which makes the dashlet render again.