Check_MK Werk 5833: Fixed handling of 'acknowledged' parameter of the EC's UPDATE command

ID: 5833 Title: Fixed handling of 'acknowledged' parameter of the EC's UPDATE command Component: Event Console Level: 1 Class: Bug fix Version: 1.5.0i4 Previously, the 'acknowledged' parameter of the EC's UPDATE command was processed after the event was already (partially) updated. When the 'acknowledged' parameter was missing or not an integer, this behavior was confusing and could e.g. lead to missing history entries. Now all parameters are checked before the event is modified, so no partial updates happen. Furthermore, the 'acknowledged' parameter is optional now, restoring the previous accidental behavior in a clean way.