Mitigate wkhtmltopdf regression
Mitigate wkhtmltopdf regression

See https://github.com/wkhtmltopdf/wkhtmltopdf/issues/3241
fnaard/pltraining-classroom,puppetlabs/pltraining-classroom,fnaard/pltraining-classroom,carthik/pltraining-classroom,binford2k/pltraining-classroom,binford2k/pltraining-classroom,samuelson/pltraining-classroom,joshsamuelson/pltraining-classroom,samuelson/pltraining-classroom,joshsamuelson/pltraining-classroom,puppetlabs/pltraining-classroom,fnaard/pltraining-classroom,carthik/pltraining-classroom,binford2k/pltraining-classroom,joshsamuelson/pltraining-classroom,puppetlabs/pltraining-classroom,samuelson/pltraining-classroom,carthik/pltraining-classroom