Problem 782

Before creating a new material I check if it already exist with the
following line:
  G4Material* mat = G4Material::GetMaterial( name );
since I am creating materials as needed and I could have two logical
volumes with the same material.
In my first check I get the print-out:
 ---> warning from G4Material::GetMaterial(). The material: name does
 not exist in the table. Return NULL pointer.
In my case the fact that the pointer is null is fine because I then
create it.
I would like to be able to switch off this message in my normal job,
where as I said is not a problem.
Could the printing of this message be under the control of the user?