In the documentation of boxes_box.inc render():
```
Render a block. Must return an array with the keys
   * 'delta', 'title', 'subject' (same as title) and 'content'.
   *
   * title AND subject need to be present to avoid that block module overrides
   * title.
```
Since we override it and "force" the facet content, we need to fix those values.