db/version_set.cc: use !empty() instead of 'size() > 0'
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().
Fix for:
[db/version_set.cc:2250]: (performance) Possible inefficient
checking for 'column_families_not_found' emptiness.
Signed-off-by: NDanny Al-Gaaf <danny.al-gaaf@bisect.de>
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