fix: use debug instead of info when missing zmin

DDG4/python/DDSim/Helper/ParticleHandler.py

@@ -141,8 +141,8 @@ class ParticleHandler(ConfigHelper):
       try:
         user.TrackingVolume_Zmin = DDG4.tracker_region_zmin
       except AttributeError as e:
-        logger.info("Attribute tracker_region_zmin for asymmetric tracker region missing %s", e)
-        logger.info("  will use symmetric region defined by tracker_region_zmax")
+        logger.debug("Attribute tracker_region_zmin for asymmetric tracker region missing %s", e)
+        logger.debug("  will use symmetric region defined by tracker_region_zmax")
         user.TrackingVolume_Zmin = str(-float(user.TrackingVolume_Zmax))
 
       logger.info(" *** definition of tracker region *** ")