BUG: Fix failing test: ctkButtonGroupTest1, when not in interactive mode
BUG: Fix failing test: ctkButtonGroupTest1, when not in interactive mode

we tried to print arguments that didn't exist, generating a segfault.

mehrtash/CTK,laurennlam/CTK,lassoan/CTK,SINTEFMedtek/CTK,finetjul/CTK,mehrtash/CTK,sankhesh/CTK,danielknorr/CTK,jcfr/CTK,sankhesh/CTK,commontk/CTK,espakm/CTK,pieper/CTK,151706061/CTK,Sardge/CTK,finetjul/CTK,mehrtash/CTK,laurennlam/CTK,AndreasFetzer/CTK,AndreasFetzer/CTK,vovythevov/CTK,AndreasFetzer/CTK,151706061/CTK,CJGoch/CTK,danielknorr/CTK,vovythevov/CTK,CJGoch/CTK,SINTEFMedtek/CTK,ddao/CTK,vovythevov/CTK,SINTEFMedtek/CTK,commontk/CTK,lassoan/CTK,sankhesh/CTK,danielknorr/CTK,rkhlebnikov/CTK,laurennlam/CTK,rkhlebnikov/CTK,151706061/CTK,jcfr/CTK,SINTEFMedtek/CTK,Heather/CTK,jcfr/CTK,ddao/CTK,naucoin/CTK,jcfr/CTK,fedorov/CTK,msmolens/CTK,espakm/CTK,ddao/CTK,Sardge/CTK,Heather/CTK,CJGoch/CTK,naucoin/CTK,CJGoch/CTK,laurennlam/CTK,pieper/CTK,ddao/CTK,lassoan/CTK,msmolens/CTK,mehrtash/CTK,pieper/CTK,espakm/CTK,fedorov/CTK,finetjul/CTK,commontk/CTK,151706061/CTK,pieper/CTK,naucoin/CTK,rkhlebnikov/CTK,commontk/CTK,Sardge/CTK,sankhesh/CTK,jcfr/CTK,CJGoch/CTK,finetjul/CTK,msmolens/CTK,Heather/CTK,fedorov/CTK,lassoan/CTK,AndreasFetzer/CTK,msmolens/CTK,fedorov/CTK,151706061/CTK,Sardge/CTK,SINTEFMedtek/CTK,danielknorr/CTK,rkhlebnikov/CTK,vovythevov/CTK,espakm/CTK,naucoin/CTK,Heather/CTK