Check_MK Werk 2474: Fixed possible corruption of user datasets (contact, mail, rbn config)

ID: 2474 Title: Fixed possible corruption of user datasets (contact, mail, rbn config) Component: WATO Level: 1 Class: Bug Fix Version: 1.2.7i3 When moving user notification rules in an installation where a lot of users are working with the GUI, it could happen that the file which stores contact, mail and user rbn configuration (contacts.mk) could corrupt and lead to lost attributes for all the users.