util.dataforms: Don't treat invalid jid-multi as missing If all the submitted JIDs were invalid, #results would be 0 and the field would be treated as absent rather than invalid.

return {
  _all = {
  },
  default = {
    ["exclude-tags"] = "mod_bosh,storage,SLOW";
  };
  bosh = {
    tags = "mod_bosh";
  };
  storage = {
    tags = "storage";
  };
}