Issue #202 wontfix
Although the title seems a bit weird, I'll show how to reproduce it, and why it makes sense:
Create a new SVN repository.
Make some empty dirs inside this repository.
Commit these new directories. Now the subversion repository has a few directories. In other words, if you do a checkout, those directories will be created in your local copy.
If you clone this svn repo using hgsubversion, no changesets will be imported and no directories will be created. You can notice that these "empty" changesets won't be imported because "hg pull" will get those empty again, but they won't be imported.
Another bug very close to this one is that empty dirs are not created: