Give more verbose logging / error.

[doaortu]

Add more verbose error. For example: when I'm not using cookies / login. the getTweet function sometimes gave me null. It turns out when I'm using similar library, the post detected as sensitive content. so I need logged in first

[catdevnull]

Please focus the issue in that specific problem: the lack of an error when a tweet is sensitive and there isn't any user logged in.