[PATCH v2] convert: legitimately disable clean/smudge filter with an empty override

From: Lars Schneider <larsxschneider@gmail.com>

diff to v1:
* improve commit message (Thanks Junio & Torsten)
* check for empty filter strings in apply_filter to catch all use cases (Thanks Peff)
* use more idiomatic style to check for an empty string (Thanks Eric)
* use test_config/test_config_global to set configs (Thanks Eric)
* use test_must_be_empty to check for empty err file (Thanks Eric)

Cheers, Lars

Lars Schneider (1):
  convert: legitimately disable clean/smudge filter with an empty
    override

 convert.c             |  2 +-
 t/t0021-conversion.sh | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

-- 2.5.1