When a schedule only has a limited amount of runs it can happen
(e.g. 2022-10-01 8:00/30), $next will be undef after the last run.
Exit early in that case.
Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
a simple api call to simulate calendar event triggers
takes a schedule, an optional number (default 10), an optional starttime
(default 'now') and returns a list with unix timestamps, as well as
humanly readable utc timestamps.
Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
