title: I keep getting a can't convert nil to String but can't debugy in Rails 3
body: <p>How can I code this so that the exception will output which method and specific instance of contact is the problem? </p>
  
  <pre><code> sub_message =
   13       message.gsub("{FirstName}", contact.first_name).
   14            gsub("{LastName}", contact.last_name).
   15            gsub("{Title}", contact.title || "blank").
   16            gsub("{Signature}", contact.user.signature.to_s).
   17        #    gsub("{Company}", contact.company_name.clear_company).
   18            gsub("{Colleagues}", colleagues.to_sentence).
   19            gsub("{NextWeek}", next_week.strftime("%A, %B %d")).
   20            gsub("{FollowingWeek}", (Date.today + 14.days).strftime("%A, %B %d")).
   21            gsub("{UserFirstName}", contact.user.first_name).
   22            gsub("{UserLastName}", contact.user.last_name).
   23            gsub("{City}", contact.address.city.titleize || "default city").
   24            gsub("{State}", contact.address.state || "default state").
   25            gsub("{Zip}", contact.address.zip || "default zip" ).
   26            gsub("{Phone}", contact.phone.format_phone || "default phone" ).
   27            gsub("{Street1}", contact.address.street1.titleize || "default street").
   28            gsub("{Today}", (Date.today).strftime("%A, %B %d")).
   29            gsub("{CustomField1}", contact.custom_field_1.to_s || "custom").
   30            gsub("{PageBreak}", "p{page-break-after: always}. ")
  </code></pre>