Don't show replication status for a dot if not an admin

[Godley]

at the mo if a user is not an admin for a cluster and they run dm dot show <whatever>, they get:

Replication Status:
unable to fetch replication status (Response '{"jsonrpc":"2.0","error":{"code":-32000,"message":"Userid 9a74c7a2-609d-4d17-54d7-831e1a624d01 is not admin user","data":null},"id":3510942875414458836}
' yields error Userid 9a74c7a2-609d-4d17-54d7-831e1a624d01 is not admin user), proceeding...

or similar. Would be better to detect the error and not include replication status in dm dot show's output.