Check_MK Werk 8307: Fix error in agent bakery page if no agent for a certain has is existing

ID: 8307 Title: Fix error in agent bakery page if no agent for a certain has is existing Component: WATO Level: 1 Class: Bug Fix Version: 1.2.7i3 In case of an unclean state in the agents directory there are symbolic links to non-existing agent configurations. This is e.g. the case if hosts had been removed in certain Check_MK versions. This has been fixed.