avocado: Avoid getting `TreeNode.multiplex` attribute directly
The `multiplex` argument is soon to be removed from the default
variables of the `tree.TreeNode`. Let's adjust the code, where we keep
the knowledge about the multiplexing to get the option or return None
when not present. The ultimate goal is obviously removing all those
places, but let's keep them optional until we have all the API available
to remove those direct low-level usages.
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>
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