TypeError: 'NoneType' object has no attribute '__getitem__'

Buildbot版本：(0.8.10)

Bug：TypeError: ‘NoneType‘ object has no attribute ‘__getitem__‘

参考页面：http://trac.buildbot.net/ticket/3107?cversion=0&cnum_hist=3

修改文件slaves.py中出错部分的代码为

1         try:
2             max_builds = int(request.args.get(‘numbuilds‘, [‘10‘])[0])
3         except (TypeError, ValueError):
4             max_builds = 10