Krikri::TaskExecutor::LoopLabelError
Raised when a loop_control.label fails to template: ansible-core
fails the ITEM with "Failed to template loop_control.label: <err>"
(round 5250000, veselahouba.openvpn's label {{ openvpn_client.name }} over a dict item) - the old silent fallback rendered the label
as the "undefined" sentinel text and let the task sail through as
ok/skipped where real fails it.