Fixed group SQL optimization to not duplicate query when just users a…

…re in audience

app/models/audience.rb

@@ -109,7 +109,7 @@ def prepare_recipients(options = {})
         sql += " AND `audiences_jurisdictions`.audience_id = #{self.id} AND `role_memberships`.jurisdiction_id = `audiences_jurisdictions`.jurisdiction_id" if has_jurisdictions
         sql += "#{publicsql})"
         sql += " UNION DISTINCT " if has_users
-      else
+      elsif has_jurisdictions
         sql += "(SELECT DISTINCT `users`.id, `users`.last_name, `users`.display_name, `users`.email"
         sql += ", (#{subselect}) AS memberships" if options[:role_memberships]
         if options[:devices]