mica.starcheck identifies no-starcat obsids as being "pre timelines"

For example, obsid 49961 (a dark cal replica) has no star catalog, so it has no value for "mp_starcat_time" in the database of starchecks. None is apparently less than '2001:001' etcs in a date comparison at:

mica/mica/starcheck/starcheck.py

Line 219 in 32a3291

    
           if len(starchecks) and (starchecks[-1]['mp_starcat_time'] < '2001:001:00:00:00.000'):