Check_MK Werk 2551: Fixed locking issues when editing dashboards

ID: 2551 Title: Fixed locking issues when editing dashboards Component: Multisite Level: 1 Class: Bug Fix Version: 1.2.7i3 In previous versions it might occur that users experience exceptions about non parsable user_dashboards.mk files when editing dashboards. This was caused by non existant file locking during editing of dashboards.