Do not add multi-name if empty.

Otherwise the name won't match the one in the module as some spaces are
added at the end.
Use blenop params when exporting with the style.

This is probably a left over of the initial implementation I did. I see
no reason to not use the blenop params here.
Merge branch 'fix-export-with-style'

* fix-export-with-style:
  Use blenop params when exporting with the style.
  Do not add multi-name if empty.