Previously if the ovirt_vm module was executed without graphical_console
parameter, the task failed with "NoneType has no attribute 'get'". The
problem was that we obtained the graphical_console by
self.param('graphical_console', dict()), which returned None, in case
graphical_console is not passed instead of empty dict. So we must
change the line to self.param('graphical_console') or dict().
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