keeper command line client does not exit when run with no arguments

[James Henstridge]

If I run the keeper command line client with no arguments, it prints a debug message and then sits sits hangs seemingly doing nothing:

    $ /usr/lib/x86_64-linux-gnu/keeper/keeper

    [debug] More or none arguments (src/cli/command-line.cpp:98)

I assume the tool is intended to only be called with a sub-command as an argument, so in this case I would expect it to print an error and exit immediately.