HQL query validation should allow selecting static values with script right

Queries like

{{velocity}}
$services.query.hql('select 1 from XWikiDocument').setLimit(1).execute()
{{/velocity}}

should be allowed without programming right. This can be useful if you're, e.g., just interested if a certain value exists in a database table without selecting any actual data from the table. It shouldn't be possible to learn anything about the data in the database tables that you cannot also learn from an inner join with that table which is already allowed.