Fix #7168 About incorrect start time displayed for canceled jobs not yet running

Fix #7168 About incorrect start time displayed for canceled jobs not yet running

All the jobs that are canceled while they are still in the run queue (duplicate)
are not reporting the start time correctly.

Example:

  Scheduled time:         10-Dec-2020 13:15:01
  Start time:             01-Jan-1970 01:00:00
  End time:               10-Dec-2020 13:15:01
  Elapsed time:           50 years 11 months 26 days 13 hours 15 mins 1 sec

The fix will display an empty start time

  Scheduled time:         10-Dec-2020 13:15:01
  Start time:
  End time:               10-Dec-2020 13:15:01
  Elapsed time:           1 sec