error if sign command has no arguments

rickard@fou:~/opendnssec/signed$ signer_engine_cli sign
connecting to /var/run/opendnssec/engine.sock
Error handling command: list index out of rangeTraceback (most recent call last):
File "/usr/local/lib/opendnssec/signer/Engine.py", line 231, in handle_command
if args[1] == "all":
IndexError: list index out of range