Merge branch 'fixDeletionOfFwd' into 'master'

prevent purging when deleting fwd of deleted iaddress

See merge request !59

lib/iapi/routes/users_admin.rb

@@ -117,7 +117,7 @@ class IApi < Sinatra::Base
         if email = EmailIaddress.by_email(email)
           if fwd = email.email_forwards.where(target: target).first
             fwd.destroy!
-            email.destroy! if email.unused?
+            email.destroy! if email.unused? && !email.deleted?
             return json result: 'success'
           end
         end