Fixes #3411: display error notification in rule edit form
Merge pull request #156 from fanf/bug_3411/error_notification_are_not_displayed_in_rule_edit_form

Fixes #3411: display error notification in rule edit form
Fixes #3420: allows to remove node
Merge pull request #160 from fanf/bug_3420/remove_node_leads_to_deployment_error

Fixes #3420: allows to remove node
Merge branch 'branches/rudder/2.4' into branches/rudder/2.5
Merging 2.5 into 2.6