[repo] Don't crash on start when fs schema is missing some db schema entities
This occurs usually while developping and we don't want systematically to
rebuild the database to start the instance or run e.g. i18ninstance.
Document: cubicweb-doc
Title: CubicWeb documentation
Author: Logilab
Abstract: Some base documentation for CubicWeb users and developpers
Section: Apps/Programming
Format: HTML
Index: /usr/share/doc/cubicweb-documentation/html/index.html
Files: /usr/share/doc/cubicweb-documentation/html/*