Always catch runtime errors

I noticed that my express app would crash when minify was set to true (and a template had a runtime error) instead of allowing me the chance to serve a nicely formatted 500. Does catching / not catching runtime errors have something to do with minification? I am assuming runtime.rethrow was affected as you can see in my pull request.

Also, the minify option was set for the middleware - it seems maybe confusing to me that these options also affect express's view engine (server-side rendering), so maybe there is a separate issue there?