Iterating on collections of enrollments generates intermittent failures.

[eriko]

While running

c_section_enrollment.each do |c_enrollment|
  #do stuff on c_enrollment
end
                    ````

there are the following errors at line ```c_section_enrollment.each do |c_enrollment|```

>  /Users/eriko/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/virtus-1.0.5/lib/virtus/instance_methods.rb:96:in `public_send'
>     /Users/eriko/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/virtus-1.0.5/lib/virtus/instance_methods.rb:96:in `[]'
>     bin/entran:321:in `block (5 levels) in <module:Wrapper>'
>     /Users/eriko/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/pandarus-0.7.0/lib/pandarus/remote_collection.rb:24:in `block (2 levels) in each'
>     /Users/eriko/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/pandarus-0.7.0/lib/pandarus/remote_collection.rb:23:in `each'
>     /Users/eriko/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/pandarus-0.7.0/lib/pandarus/remote_collection.rb:23:in `block in each'
>     /Users/eriko/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/pandarus-0.7.0/lib/pandarus/remote_collection.rb:35:in `each_page'
>     /Users/eriko/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/pandarus-0.7.0/lib/pandarus/remote_collection.rb:22:in `each'

[eriko]

This does not happen on 0.6.11