Don't add empty authors to works

[George]

There's a persistent bug on WWW that spews template errors. Seems to have something to do with blank author.

Here's an example:
http://openlibrary.org/works/OL15193670W/La_Belleza_%C3%BAtil

/upstream/templates/type/work/view.tmpl: error in processing template: TypeError: sequence item 0: expected string, instance found (falling back to default template)
/upstream/templates/covers/book_cover.tmpl: error in processing template: TypeError: sequence item 0: expected string, instance found (falling back to default template)
/opt/openlibrary/production/openlibrary/plugins/upstream/templates/covers/book_cover.html: error in processing template: TypeError: sequence item 0: expected string, instance found (falling back to default template)

I notice in the error log that there are about 30 of these being thrown every day.

[George (george-archive)]

Edward said:

I fixed the templates to skip these empty authors. Here is another example that was giving the error, but doesn't do now:
http://openlibrary.org/works/OL15193521W/MzQfSihcsLPSKYOmSVG

[Edward Betts (edwardbetts)]

http://openlibrary.org/works/OL15193521W.json says:

"authors": [{"type": {"key": "/type/author_role"}}]

We shouldn't be adding blank authors to works in Open Library.

[Anand Chitipothu (anandology)]

Fix committed.

Working on a script to fix the existing ones.

[Anand Chitipothu (anandology)]

Found 116 works records with none authors and fixed all of them. I
used the dump on 2010-06-30 to find the bad ones. Some more might have
got added after that. I need to check the newly added works.

[Anand Chitipothu (anandology)]

Fixed the remaining 210 more records from 2010-07-31 dump.

[Anand Chitipothu (anandology)]

Looks like there are some more. reopening the bug.