Check_MK Werk 4397: Views: Fixed datasource KeyError exception

ID: 4397 Title: Views: Fixed datasource KeyError exception Component: Multisite Level: 1 Class: Bug fix Version: 1.5.0i1 When e.g. a Event Console related view was added to a dashboard and then the Event Console was disabled or that site, this could lead into a KeyError exception when rendering the dashboard, because the datasource was not existant anymore.