[SDRuby] Actionmailer - How to still send emails where some email addresses are null

[KT]

 

I have a Rails 3 app sending emails to multiple (2) recipients. The first 
recipient is required, but the second is not required. I get an error if 
the second recipient is null. How do I bypass the secondary email if null 
without getting an error?

  def email_approvers(invoice)
    @subject          = 'Invoice Approval Request'
    @body["invoice"]  = invoice
    @recipients       = invoice.approver_email, invoice.alternate_approver_email
    @from             = "..."
    @sent_on          = Time.now
    @headers          = {}    
  end

Thanks for your help!!

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