# File lib/grit/git-ruby.rb, line 200
    def blame_tree(commit, path = nil)
      begin
        path = [path].join('/').to_s + '/' if (path && path != '')
        path = '' if !path.is_a? String
        commits = file_index.last_commits(rev_parse({}, commit), looking_for(commit, path))
        clean_paths(commits)
      rescue FileIndex::IndexFileNotFound
        {}
      end
    end