Workspace validation method
When adding or configuring a workspace it is helpful to check the connection (even before the workspace is added to the db).
There is a prepared method “is_valid” in
vispa.models.workspace.Workspace:49 (as of rev. 852) which is not
implemented yet
but already in use.
(from redmine: issue id 1501, created on 2013-12-30 by root)