Generating a list.

This fixes:

```
Traceback (most recent call last):
  File "mediawiker.py", line 544, in <lambda>
    sublime.set_timeout(lambda: self.window.show_quick_panel(self.site_keys, self.on_done), 1)
  File "sublime.py", line 341, in show_quick_panel
    if len(items) > 0 and isinstance(items[0], list):
TypeError: object of type 'map' has no len()
```