fix bug with out_cat_only option

ObservationSim/ObservationSim.py

@@ -239,7 +239,7 @@ class Observation(object):
                 try:
                     if self.config["run_option"]["out_cat_only"]:
                         isUpdated = True
-                    if chip.survey_type == "photometric" and not self.config["run_option"]["out_cat_only"]:
+                    elif chip.survey_type == "photometric" and not self.config["run_option"]["out_cat_only"]:
                         isUpdated, pos_shear = obj.drawObj_multiband(
                             tel=self.tel,
                             pos_img=pos_img,