When using a database that doesn't exist on a secondary node, and performing a find query - the database is created on the secondary only.
There's no way to delete it from the server due to "not master" error.
The only way to bypass it, is to create the database on the primary node and to drop it.

The commands for reproduce:
Secondary:
use ops_test
db.config.find(

)

Mongo version 2.6.7
Ubuntu 12.04.5 LTS
Mongo shell from bash