Fix issue when setting up MongoDB from wizard

When I set up my nuxeo server from the wizard and select mongoDB as nosql backend, I have an error that prevents the server from restarting.

What I set up, using distribution nuxeo-server-tomcat-9.1-I20170403_1016-full.zip:

1. Start Mongo (empty)
2. Start Redis
3. In nuxeo.conf:

   nuxeo.wizard.done=false
   org.nuxeo.connect.url=https://nos-test-connect.nos.nuxeo.com/nuxeo/site/
   nuxeo.redis.enabled=true
   nuxeo.redis.host=127.0.0.1
   

4. Run the wizard with nuxeoctl UI. At database setup step, select MongoDB as nosql. Leave default values.
5. At Modules step, unselect all addons, so as to have bare nuxeo-server instance.
6. At the end of the wizard, click Start Nuxeo.
   => Server is stopped and fails to restart. See attached stacktrace.
   Looking at nuxeo.conf, I have nuxeo.templates=default, no mongodb.