no unbound-control without certificates?

[A. Schulze via Unbound-users]

Hello,
after update from 1.5.9 to 1.5.10 "unbound-control reload" no longer work:

the relevant unbound.conf section:
    remote-control:
      control-enable: yes
      control-interface: /path/to/unbound-control.socket
      control-use-cert: no

# ls -la /path/to/unbound-control.socket
srw-rw---- 1 unbound unbound 0 Nov  3 14:24 /path/to/unbound-control.socket

# unbound-control reload
error: SSL handshake failed
140666240513792:error:141640B5:SSL  
routines:tls_construct_client_hello:no ciphers  
available:ssl/statem/statem_clnt.c:815:

Andreas