"git foo_bar" prints two config errors

% git foo_bar error: invalid key: pager.foo_bar error: invalid key: alias.foo_bar git: 'foo_bar' is not a git command. See 'git --help'.

git.c calls alias_lookup() and check_pager_config() resulting in calls to git_config_parse_key() with the above keys. I looked at the code and it's not immediately obvious how to suppress the error in this particular case. You also get an error for the empty argument and anything that isn't (isalnum || '-') (I discovered the _ case by accidentally leaving out the 'grep' before searching for a function),

% git ''; git の error: key does not contain variable name: pager. error: key does not contain variable name: alias. git: '' is not a git command. See 'git --help'. error: invalid key: pager.の error: invalid key: alias.の git: 'の' is not a git command. See 'git --help'.

but, % ln -s /bin/tty ~/bin/git-の; ln -s /bin/tty ~/bin/git-foo_bar % git の error: invalid key: pager.の /dev/pts/51 % git foo_bar error: invalid key: pager.foo_bar /dev/pts/51

The command itself is accepted, so I think we shouldn't print the errors.