[DNSB]

Originally Posted by Divingduck

Oh, my fault...

This one should work like you want

program:
contains(ifempty(field('series'),'-'),'-',template('{authors} - {title}'),template('{authors} {series:|(| }{series_index:0>5.2f|#|)} {title}'));

Remark:
Its working in program mode.
I check for series and give back series or '-' if there is no series.
contains check for '-' and use then one of the two template structures.

Not elegant but works.

Edit: Forgot to mention that you need to copy the complete string (both lines) in your template. You can do this direct or via the template editor

Looking at your code, I suspect that it will write all the books into a single directory instead of the default Author_Sort directories inside the selected Save to directory.

I suspect adding {author_sort}/ to the templates between the ' and the {author} would return to the default saving into author_sort folders.

program:
contains(ifempty(field('series'),'-'),'-',template('{author_sort}/{authors} - {title}'),template('{author_sort}/{authors} {series:|(| }{series_index:0>5.2f||)} {title}'));

Serial numbers filed off and saved for future reference....