Re: [PATCH v2] ref-filter.c: pass empty-string as NULL to atom parsers

> Peff points out that different atom parsers handle the empty
> "sub-argument" list differently. An example of this is the format
> "%(refname:)".
> 
> Since callers often use `string_list_split` (which splits the empty
> string with any delimiter as a 1-ary string_list containing the empty
> string), this makes handling empty sub-argument strings non-ergonomic.
> 
> Let's fix this by assuming that atom parser implementations don't care
> about distinguishing between the empty string "%(refname:)" and no
> sub-arguments "%(refname)".
> 
> Signed-off-by: Taylor Blau <me@ttaylorr.com>
> ---
>  ref-filter.c            | 10 +++++++++-
>  t/t6300-for-each-ref.sh |  1 +
>  2 files changed, 10 insertions(+), 1 deletion(-)