CQ5.6 Workflow Model Query

Hi ,
I have a query regarding , the Workflow model configuration.

When Author starts workflow model requirement is :-

  Send email(for Author, workflow is subjected) >Approver> two option 1. approve content(Activate page) > send e-mail (approved e-mail for author)

                                                                                                     2 . reject content(select initator)> send e-mail(reject email for author )  

                                                                                             then workflow ends .

Issue is like ,when work flow ends .trigger's a  default  mail  stating there is  no information avaiable .how to avoid this extra mail triggering