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wayland: No xdg-output events without a logical monitor

Olivier Fourdan requested to merge ofourdan/mutter:issue194-bis into master

To avoid a known race condition in the wl_output protocol documented in https://phabricator.freedesktop.org/T7722, mutter delays the wl_output destruction but nullify the logical_monitor associated with the wl_output and the binding routine bind_output() makes sure not to send wl_output events if the logical_monitor is NULL (see commit 1923db97).

The binding routine for xdg_output however does not check for such a condition, hence if the output configuration changes while a client is binding to xdg-output (typically Xwayland at startup), mutter would crash while trying to access the logical_monitor which was nullified by the change in configuration.

Just like bind_output() does for wl_output, do not send xdg-output events if there is no logical_monitor yet.

Closes: #194 (closed)

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