obj_bencher.cc: use empty() instead of 'size() == 0' to check for emptiness

obj_bencher.cc: use empty() instead of 'size() == 0' to check for emptiness

Use empty() since it should be prefered as it has, following the
standard, a constant time complexity regardless of the containter
type. The same is not guaranteed for size().

Signed-off-by: Danny Al-Gaaf <danny.al-gaaf@bisect.de>