[99] Remove empty tags produced by munging all non-ascii tags

I thought this way of filtering was easier to read than filter(None, tags)
[101] Use name from database when reharvesting package
Merge branch '101-modified-package-name' of https://github.com/morty/ckanext-harvest into morty-101-modified-package-name
Merge branch 'morty-101-modified-package-name'
Merge branch '99-all-non-ascii-tags' of https://github.com/morty/ckanext-harvest into morty-99-all-non-ascii-tags
Merge branch 'morty-99-all-non-ascii-tags'