Consultations created before version 0.16 do not work if there is no scope (global scope)

Version 0.16 requires that consultations have an scope assigned. This was not necessary in previous versions. Based on this requirement, the consultations created in older versions do not work with the update at 0.16. To control this possibility, you could do a migration to add the scope or a rake task. You could also opt for a try (: name), since it currently looks for an scope.name and it does not work because scope is nil.