virttest.qemu_devices: Fix QStringDevice.cmdline problem
when False/None was set as cmdline this device always failed.
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>
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when False/None was set as cmdline this device always failed.
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>