If you go to Sacramento’s Central Library, you’ll see that the I Street sidewalk looks empty. That’s because all the benches are gone. A library official said the benches were removed in part because they were obstructing the area for disabled patrons. But an advocate for the city’s homeless population disagrees, and thinks the benches were removed because homeless people used them for resting. All the benches -- there were more than 15 -- were taken away from the library’s sidewalk, according to Don Tucker, director of facilities for the Sacramento Public Library. The city’s Parks and Recreation Department will refinish the old benches and place them in various locations in Sacramento,