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compositor: fix crash in xdg_output_manager_get_xdg_output after head removal

Arnaud Vrac requested to merge rawoul/weston:rawoul/xdg-output-get-output-protoerror into main

When a head is removed and destroyed, the associated wl_output resources user data is reset to null.

When a client calls zxdg_output_manager_v1::get_xdg_output on a removed wl_output (which the client might not be aware of yet), this could trigger a crash as the output resource would be assumed to still represent a valid head.

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