#Delete Identical Features based on Field Name and Rig Number field, not deleting field names with null values.
FC = r'C:ScriptsDrilling_Rig_DeduplicationDrilling_Rigs.gdbMERGED_RIGS'
cursor = arcpy.UpdateCursor(FC)
for row in cursor:
   fieldValue = row.FIELD_NAME
   if row.FIELD_NAME is not None:
     arcpy.DeleteIdentical_management(FC, ["FIELD_NAME","RGNMBRCLC"])
   else:
    print "nothing left to delete"
del row, cursor

print "dedup process done"
print arcpy.GetMessages()