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monitors/alsa: handle node activation failure

P V requested to merge pvir/wireplumber:fix-alsa-err into master

When node activation fails, it won't be created and its object-removed signal can be called with some properties missing. This breaks node name deduplication, causing error

wplua: [string "alsa.lua"]:182: attempt to concatenate a nil value (local 'node_name')

It occurs e.g. when switching ALSA device profile, while some application has opened the device with ALSA and is keeping it busy.

Fix by handling the activation failure, and tolerating missing property in object-removed.

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