Initialize visit_polygons further up

Author: arunkannawadi

python/lsst/cell_coadds/_fits.py

@@ -296,6 +296,7 @@ def readAsMultipleCellCoadd(self) -> MultipleCellCoadd:
                 psf_shape=afwGeom.Quadrupole(),
                 psf_shape_flag=True,
             )
+            visit_polygons = {}
             if written_version >= version.parse("0.3"):
                 visit_dict = {
                     row["visit"]: VisitRecord(
@@ -323,7 +324,6 @@ def readAsMultipleCellCoadd(self) -> MultipleCellCoadd:
 
                 if written_version >= version.parse("0.6"):
                     visit_summary_hdu = hdu_list[hdu_list.index_of("VISIT_SUMMARY")]
-                    visit_polygons = {}
                     for row in visit_summary_hdu.data:
                         visit = int(row["visit"])
                         obs_id = ObservationIdentifiers(