DD4hep DDDigi not configuring without DDG4 package

[andresailer]

Since today (yesterday).
When the DDG4 package is not enabled there is a problem with the DDDigi Cmake

-- |++++> Building dictionary ... G__DDDigi
-- |++> Building Plugin: DDDigiPlugins
-- |++> Geant4 not used. DDDigi will not be able to read DDG4 output.
CMake Error at DDDigi/CMakeLists.txt:68 (set_target_properties):
  set_target_properties Can not find target to add properties to:
  DDDigi_DDG4_IO


CMake Error at DDDigi/CMakeLists.txt:72 (install):
  install TARGETS given target "DDDigi_DDG4_IO" which does not exist.