`M-x weibo-timeline RET` sometimes kills current buffer

[xuchunyang]

I can reproduce by following these steps:

1. Launch emacs normally, switch to *scratch* buffer automatically
2. Hit M-x weibo-timeline, switch to *weibo-timeline* buffer automatically
3. Hit M-x list-buffers, I cannot find *scratch* buffer

I am using the master branch of weibo.emacs and my emacs version is "25.0.50.5". I have following config for weibo.emacs (simply require weibo feature and set up weibo key/secret).

(use-package weibo
  :load-path "~/wip/weibo.el/"
  :config
  (load-file "~/.private.el"))