Revert "Disable limited exception pages in production"

This reverts commit d012493.

config/environments/production.rb

@@ -7,14 +7,6 @@
   # Full error reports are disabled and caching is turned on
   config.consider_all_requests_local       = false
   config.action_controller.perform_caching = true
-  # Disable even limited exception/debug pages in production for two reasons:
-  #  1) our backend rails apps get X-Forwarded-For & Client-IP for all requests 
-  #     as 10.x.x.x, which is a trusted proxy. This means they render the 
-  #     limited exception/debug pages.
-  #  2) our backend rails apps receive requests from other apps that might 
-  #     appear to be on trusted proxy IPs, so we might render exception/debug
-  #     page, which could then be exposed in a frontend app to the world.
-  config.action_dispatch.show_exceptions = false
 
   # Disable Rails's static asset server (Apache or nginx will already do this)
   config.serve_static_assets = false