job scheduler: Do not try to sleep if no time left

If one iteration one iteration of the job scheduler takes longer than
the 60 seconds interval, the scheduler will do the next cycle
immediately without any sleep in between.

Change-Id: Iad25ab11f685fb0b250c79734f369943e0bc9eec

cmk/gui/job_scheduler.py

@@ -109,7 +109,8 @@ def _run_scheduler(crash_report_callback: Callable[[Exception], str]) -> None:
             crash_msg = crash_report_callback(exc)
             logger.error("Exception in scheduler (Crash ID: %s)", crash_msg, exc_info=True)
 
-        time.sleep(60 - (time.time() - cycle_start))
+        if (sleep_time := 60 - (time.time() - cycle_start)) > 0:
+            time.sleep(sleep_time)
     _wait_for_job_threads(job_threads)