Small fixes: update check, epub:
authorNiki Roo <niki@nikiroo.be>
Sat, 15 Jul 2017 07:32:26 +0000 (09:32 +0200)
committerNiki Roo <niki@nikiroo.be>
Sat, 15 Jul 2017 07:32:26 +0000 (09:32 +0200)
- update check will now be more clear when it cannot contact github.com
- epub support will now fail with "epub not supported" instead of NPE


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