[DRE-maint] Bug#695774: redmine: fails to upgrade, says something about a pgsql_adapter

[Jérémy Lal]

There are problems i can reproduce easily when doing :

* purge instances databases
* reconfigure, set instance default, do not install db
* reconfigure, keep instance default, install db
-> a succession of warnings from dbconfig, eventually installs
db.

or doing 

* reconfigure database using a different db type.
  It just seems to make it forget about the db installed
  under the previous type.

dbconfig-common isn't fool proof, and my redmine postinst
script make it worse.

But i can't see how you can end without any database type set...

Jérémy.