Setup search engine may link to non-existing section

Steps to reproduce

1. Log in an admin
2. Go to Site administration > Plugins > Search
3. Select "Simple search" as the search engine
4. Click "Setup search engine"

Expected behaviour: If the link is displayed, it should open a page allowing to setup the search engine

Actual behaviour: Error page: Section error! because the Simple search plugin does not define any site admin section called "searchsimpledb"