Hiding PHP's WSOD with Nginx

[CJ Ess]

My employer uses Nginx in front of PHP-FPM to generate their web content.
They have PHP's error reporting shut off in production so when something
does go wrong in their PHP scripts they end up with a "White Screen Of
Death". From a protocol level the white screen of death is a 200 response
with no content. They were wondering if there was a way to detect the WSOD
within Nginx and substitute their 500 error page.

PHP-FPM typically uses chunked encoding so I don't think the content-length
header is going to help me.

Does anyone have any suggestions how I might best accomplish this?

I looked around with Google but all of the hits were people wanting to turn
on error reporting, or looking help getting php-fpm working with Nginx to
begin with.
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