Add temporary workaround to fallback to 'Copy' PMT response model with DD4HEP

Rich/RichDigiSys/python/RichDigiSys/Configuration.py

@@ -16,6 +16,7 @@
 
 __author__ = "Chris Jones <Christopher.Rob.Jones@cern.ch>"
 
+from Gaudi.Configuration import log
 from LHCbKernel.Configuration import *
 from Configurables import (
     Rich__MC__Digi__Signal, Rich__MC__Digi__CopySummedDepositsToDigits,
@@ -113,6 +114,12 @@ class RichDigiSysConf(LHCbConfigurableUser):
                 "TimeGateLookupTableR1")
             response.TimeGateLookupTableR2 = self.getProp(
                 "TimeGateLookupTableR2")
+        elif pdModel == "DetailedPMT" and UseDD4Hep:
+            log.warning(
+                "'DetailedPMT' response model not (yet) supported with DD4HEP. Will fallback to 'Copy'."
+            )
+            response = self.makeComponent(
+                Rich__MC__Digi__CopySummedDepositsToDigits, "RichPDResponse")
 
         else:
             raise RuntimeError(