create (N-1)D elements only when createSubelements option is set to True
create (N-1)D elements only when createSubelements option is set to True

before they were created when some (N-1)D elements were already present, even when the createSubelements option was set to False


Former-commit-id: 672d9de1f07b2d0c88749c8a05708e3f109caa45
hdeling/sofa,Anatoscope/sofa,hdeling/sofa,Anatoscope/sofa,FabienPean/sofa,FabienPean/sofa,Anatoscope/sofa,hdeling/sofa,hdeling/sofa,FabienPean/sofa,Anatoscope/sofa,Anatoscope/sofa,Anatoscope/sofa,FabienPean/sofa,hdeling/sofa,hdeling/sofa,hdeling/sofa,FabienPean/sofa,FabienPean/sofa,Anatoscope/sofa,FabienPean/sofa,Anatoscope/sofa,hdeling/sofa,FabienPean/sofa,hdeling/sofa,FabienPean/sofa,hdeling/sofa,FabienPean/sofa,Anatoscope/sofa