Excessive output for convert_to_gdml

https://eicweb.phy.anl.gov/EIC/detectors/athena/-/jobs/412116

Lots of segments with

-------- WWWW ------- G4Exception-START -------- WWWW -------
*** G4Exception : CUTS0100
      issued by : G4ProductionCutsTable::ConvertRangeToEnergy()
Invoked prematurely before it is fully initialized.
*** This is just a warning message. ***
-------- WWWW -------- G4Exception-END --------- WWWW -------

These should be grepped out in the convert_to_gdml script so the log files can be used for finding other issues (validation).