NorskSettings.onNodeError property

Called when any media node created through this connection fails: its gRPC stream ends with an error (the node exited abnormally on the engine, or the stream broke), other than a close this client requested. Fires for every node, whether or not that node’s own NodeSettings.onError is set; handled says whether it was. A connection-wide place to notice a node dying when the graph would otherwise just go quiet.

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