Provide more meaningful message when DOI pattern not matched

[vsoch]

We just ran into a whedon mysterious error here:

openjournals/joss-reviews#3311

And actually the issue was that here there was a DOI that was missing the first half of the pattern, so it didn't match anything, returned nil, and whedon choked. I'm wondering if we can do some third check there for nil again, and if it's nil, print a meaningful error message? I really like Ruby (and don't get to use it super often) so if you'd like to give me guidance on how this could be best implemented I'd really enjoy doing it!

I also was trying to reproduce locally and I got as far as to run bundle exec whedon compile 3311 with my repo in tmp/3311 but then a style file was missing. I think it would be really useful to have a little more structure or guidance for how to run whedon locally (e.g., where is that style file?) so if future issues arise developers can more easily debug. Thank you!

[danielskatz]

let's make sure we have found the problem :)

[danielskatz]

ok, that was the problem - we had

DOI="journal.pone.0177459"

instead of

DOI="10.1371/journal.pone.0177459"

and the error message we got back was quite confusing (but kind of fun to debug)

[vsoch]

Agree!