- sanitize printing properties with tostring(), which will properly
convert nil values to the string "nil"
- ensure some properties become empty strings if they are nil
Allows relinking client nodes to other devices if the current device has been
removed. This allows audio to keep playing in a different device if a bluetooth
device is disconnected.
The policy scripts can handle now client nodes that want to be linked with other
client nodes. This is needed for nodes created by the Pulse Audio Volume Control
to monitor audio comming from other application client nodes.
These don't make much sense here. In the endpoint policy we want
the clients to be linked to the endpoint that matches their role
and never move.
Also, endpoint priorities are useless. If no endpoint matches the
role, then just ignore the client.
