[FIX] server: don't crash in case we can't check if a database exists
[FIX] server: don't crash in case we can't check if a database exists

In case Postresgl access rights prevents the pguser to access
`pg_database`, the server should not crash when trying to create the
database because the pguser does not have the right to check if the
database exists and he won't be able to create a new database anyway.

However the database might exists and in such a case the flow should
continue. This patch allows the flow to be resumed in such a case, and
in case the database did not actually exists, a warning will tell the
user that it was not possible to check if the db existed and the
registry for this database will fail to be loaded afterward.

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo