'git secret changes' does not work unless passed secret filenames

[joshrabinowitz]

Contrary to the docs, git secret changes does not work unless you pass it filenames of *.secret files.

In all cases with a git-secret repo, if you type

`git secret changes`

You get no errors, but output like:

     % git secret changes
    changes in /full/path/config.ini:
    <blank line>

For the command to work it must be passed the secret filenames (config.ini.secret).

[sobolevn]

That's a bug. It should not be this way.

git secret changes should by default output all changes.
And when some filenames are given - only limit this changes by these filenames.

[joshrabinowitz]

If you pass an un-hidden file you at least get a non-zero exit code:

 % git secret changes no_such_file
gpg: can't open `/home/joshr/gitsrc/jcreds-amazon/no_such_file.secret': No such file or directory
gpg: decrypt_message failed: No such file or directory
% echo $?
2