fix(session): dead sessions without layout shouldn't be resurrectable #3167
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It is possible for a dead session to not have a committed session-layout.kdl file, either because serialization is turned off, or because the session was killed before being flushed into disc. Since there isn't a file to load from, the session shouldn't be marked as resurrectable (for example, by the session-manager plugin), because its state is lost. As an example, the session-manager plugin will simply load the default layout for the dead session if selected, so it is just better to not list it at all.