CLI error message contains new lines.

If I run the following CLI command without having imported the images, I get an error. This is normal but what's not normal is that the error message contains new lines:

$ sudo maas maas nodes new architecture=amd64/generic mac_addresses=AA:AA:BB:AA:AA:01 mac_addresses=22:BB:AA:AA:AA:01 hostname=client01 powertype=virsh autodetect_nodegroup=yes
{"architecture": ["\nNo architectures are available to use for this node; boot images may not\nhave been imported on the selected cluster controller, or it may be\nunavailable.\n"]}