Fix traceback message

[rodfersou]

Traceback message becomes unreadable:

if add a whitespace: pre into this tag css it will look a lot better:

[davisagli]

+1

David Glick
(mobile)

On Sep 21, 2015, at 6:17 AM, Rodrigo Ferreira de Souza notifications@github.com wrote:

Traceback message becomes ilegible:

if add a whitespace: pre into this tag it will look a lot better:

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