for b in Book.objects.all():
add_book(db, b)
for t in Tag.objects.exclude(
- category__in=('book', 'set', 'theme')).exclude(book_count=0):
+ category__in=('book', 'set', 'theme')).exclude(items=None):
# only add non-empty tags
add_tag(db, t)
db.commit()