Revert "Completely disable exception debug pages in prod"
Revert "Completely disable exception debug pages in prod"

This reverts commit bedc0d850294dea1502ccb60c97870f210cd13b2.

alphagov/publisher,leftees/publisher,theodi/publisher,leftees/publisher,alphagov/publisher,theodi/publisher,telekomatrix/publisher,theodi/publisher,leftees/publisher,telekomatrix/publisher,telekomatrix/publisher,theodi/publisher,alphagov/publisher,leftees/publisher,telekomatrix/publisher