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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: https://gitlab.gnome.org/GNOME/mutter/issues/194 (cherry picked from commit 68ec9ac017157def9b7c25dd8141dc0e93d9f918)