If there is no conditions option, add a tautology

- If we're disabling IsParanoid, then we can't return an empty string
 from the conditions proc. If we do, it creates an empty clause in the
 sql fragment, e.g.  ((("foos".bar_id = 123456) AND (())))), which is
   not valid SQL.
- Replace that empty condition with a tautology, 1=1