Return clearer message when no spot is detected

2025-04-04 11:45:37.104Z actor 40 AgCmd.py:301 AgCmd.acquire_field:
Traceback (most recent call last):
 File "/software/mhs/products/Linux64/ics_agActor/1.1.1/python/agActor/Commands/AgCmd.py", line 244, in acquire_field
 ra, dec, inst_pa, dra, ddec, dinr, dscale, dalt, daz, *values = field_acquisition.acquire_field(design=design, frame_id=frame_id, altazimuth=True, logger=self.actor.logger, **kwargs) # design takes precedence over center
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 File "/software/mhs/products/Linux64/ics_agActor/1.1.1/python/agActor/field_acquisition.py", line 117, in acquire_field
 return (ra, dec, inst_pa, *_acquire_field(guide_objects, detected_objects, ra, dec, taken_at, adc, inst_pa, m2_pos3=m2_pos3, obswl=obswl, altazimuth=altazimuth, logger=logger, **_kwargs))
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 File "/software/mhs/products/Linux64/ics_agActor/1.1.1/python/agActor/field_acquisition.py", line 147, in _acquire_field
 dra, ddec, dinr, dscale, *diags = pfs.FAinstpa(_guide_objects, _detected_objects, ra, dec, taken_at.astimezone(tz=timezone.utc) if isinstance(taken_at, datetime) else datetime.fromtimestamp(taken_at, tz=timezone.utc) if isinstance(taken_at, Number) else taken_at, adc, inst_pa, m2_pos3, obswl, **_kwargs)
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 File "/software/mhs/products/Linux64/ics_agActor/1.1.1/lib/python/agActor/kawanomoto/FieldAcquisitionAndFocusing.py", line 85, in FAinstpa
 filtered_darray, v = pfs.sourceFilter(darray, maxellip, maxsize, minsize)
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 File "/software/mhs/products/Linux64/ics_agActor/1.1.1/lib/python/agActor/kawanomoto/Subaru_POPT2_PFS_AG.py", line 143, in sourceFilter
 ag_ccd = agarray[:,0]
 ~~~~~~~^^^^^
IndexError: too many indices for array: array is 1-dimensional, but 2 were indexed
2025-04-04 11:45:37.107Z cmds 20 CommandLink.py:122 > 2 2280 f text="AgCmd.acquire_field: too many indices for array: array is 1-dimensional, but 2 were indexed"