fix errors if no csv data or incorrect last group call specified
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<% if @success %><%= CSV.generate_line @csv_headers %><% row = [] %><% @csv_headers.each do |attr| %><% row.push(@feed.send(attr)) %><% end %><%= CSV.generate_line row %><% else %>-1<% end %>
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<% if @success && @csv_headers.present? %><%= CSV.generate_line @csv_headers %><% row = [] %><% @csv_headers.each do |attr| %><% row.push(@feed.send(attr)) %><% end %><%= CSV.generate_line row %><% else %>-1<% end %>
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