qitoolchain create: fix crash when NOT using --cmake-generator
qitoolchain create: fix crash when NOT using --cmake-generator

Change-Id: I79acae9dbaeebbe34c32915eef8ea00fb1b67b8b

dmerejkowsky/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,aldebaran/qibuild,aldebaran/qibuild