IllegalResourceName on edit when repository-path set to ../wikidata

When I set `repository-path: ../wikidata` in the config file, gitit starts and serves pages correctly. Also correctly gets updates made via `git`. However if I log in and edit page using the web interface, I can edit and preview normally, but when I try to save the only message I get is

```
Server error: IllegalResourceName
```

This depends specifically on that setting - I have a plain default config file, with this one change. Changing it to default `wikidata` works. It's not a problem with slash or dot, as `./wikidata` and `foo/wikidata` work correctly. It appears to be problem specifically with parent directory. Workaround with `./../wikidata` does not work.

I've tried `../foo/wikidata` and it has created the repository and than gave me the same error message on command line, and exited. Subsequent runs failed to create default pages, but otherwise work identically - I can view and edit via git, but cannot edit via web interface.