message: condition to check undefined relation parameter
diff: @@ -146,8 +146,10 @@ export function deleteCascade(model: Mongoose.Model<any>, updateObj: Array<any>)
  var x = <IAssociationParams>res.params;
  var props = [];
  for (let i = 0; i < updateObj.length; i++) {
  + if (updateObj[i] && updateObj[i][res.propertyKey]) {
  props.push(updateObj[i][res.propertyKey]);
  }
  + }
  if (!props || !props.length)
  return;
  ids[x.rel] = ids[x.rel] || [];
  