bucket: add count guard for branch pages in Stats (backport 1.3)#1173

ahrtr merged 1 commit intoetcd-io:release-1.3etcd-io/bbolt:release-1.3from

quocvibui:fix-stats-branch-page-oob-1.3quocvibui/bbolt:fix-stats-branch-page-oob-1.3Copy head branch name to clipboard