Add Empty Selection to Genre Drop-Down

[anna]

On the publish form, the "Animation" genre is listed by default in the drop-down menu.

This means if a user does not actually assign a genre, the video is assigned the "Animation" genre.

We should make the default selection empty - no genre - so that videos are not assigned an incorrect default genre.

[mike]

I've updated the country and genre list. I've also left only the lists managed by plumi on testing.plumi.org so that you can take a look at these also.

The em.taxonomies product puts the previous lists used by em.org back, we'll be installing these once we set up staging.em.org for migration.

[anna]

Great, done.