Bug#716975: Should deal with lack-of-curl gracefully

Currently I'm testing the next version [1]. This bug does not happen in my environment. Could you test it? [1] https://mentors.debian.net/debian/pool/main/t/twittering-mode/twittering-mode_3.1.0-1.dsc

Bug#716975: Should deal with lack-of-curl gracefully

Package: twittering-mode Version: 3.0.0-1 Severity: important Hi, If you try and run twittering-mode without curl installed, you get the following error message on start-up: Response: nil for POST https://api.twitter.com/oauth/request_token twittering-oauth-get-access-token: Failed to retrieve a