Lot of 404 due to multiroom dock

[volumio]

@bencehusi

the multiroom dock produces a lot of 404 errors since the albumart parsing is not done correctly.
This causes some delays in loading the UI and in some cases translations do not appear (known issue, angular waits for requests to be solved before making new ones, and here we trigger timeout).
See:
GEThttp://localhost:3000/%7B%7BaudioOutputs.audioOutputsService.thisOutput.state.albumart%7D%7D
[HTTP/1.1 404 Not Found 2ms]

GEThttp://localhost:3000/%7B%7Bgroup.leader.state.albumart%7D%7D
[HTTP/1.1 404 Not Found 2ms]

GEThttp://localhost:3000/%7B%7Boutput.state.albumart%7D%7D
[HTTP/1.1 404 Not Found 2ms]

GEThttp://localhost:3000/%7B%7B%20audioOutputs.audioOutputsService.thisOutput.state.albumart%20%7D%7D

[bencehusi]

Hmm, okay, I'll check how it is done elsewhere. I'll post an update when I got to it.

[bencehusi]

@volumio, fix is on hotfix/imageErrorsMultiroom. Let me know if that wouldn't work.