qcatool: prevent crash when only options on command line without any commands
qcatool: prevent crash when only options on command line without any commands

JoshuaKolden/qca,KDE/qca,oktavarium/qca,JoshuaKolden/qca,JoshuaKolden/qca,Bjoe/qca,KDE/qca,KDE/qca,karolherbst/qca,karolherbst/qca,oktavarium/qca,JoshuaKolden/qca,Bjoe/qca,Bjoe/qca,Bjoe/qca,oktavarium/qca,oktavarium/qca,karolherbst/qca,karolherbst/qca,KDE/qca