aboekhoff/congomongo — pull request #75 by jaor (2012-04-20 20:38:37+00:00)
Title: Fix for `connection?`

The `:db` entry in a connection map can be `nil`, since the connection can be used as:

```clojure
(with-connection c
(with-db d
...))
```

and the check for `c` being a connection is performed before a
database is assigned.