The display_exceptions config-option is not passed to views

[androa]

The skeleton app uses an if ($this->display_exceptions) in order to check if exceptions should be displayed: https://github.com/zendframework/ZendSkeletonApplication/blob/master/module/Application/view/error/404.phtml#L49

But this view variable is never set, it's just used in the RouteNotFoundStrategy to inject the exception: https://github.com/zendframework/zf2/blob/master/library/Zend/Mvc/View/Http/RouteNotFoundStrategy.php#L275

I guess display_exceptions either need to be set in the view or the check should be removed and just do an isset($this->exception). I'm unable to find the exact point in time where this changed and stopped working.

[androa]

So, got to debug it a bit more. The issue is this: https://github.com/zendframework/zf2/blob/master/library/Zend/Mvc/View/Http/ExceptionStrategy.php#L152

When there is a fallback exception the display_exceptions view variable is set along with the exception. If it's a 404/not found exception the exception is passed in, but display_exceptions is not.

Two different ways to fix it:
A.) Update the 404 view file to simply check if it's a exception there. https://github.com/zendframework/zf2/blob/master/library/Zend/Mvc/View/Http/RouteNotFoundStrategy.php#L275 checks if exceptions should be displayed anyways.
B.) Inject the display_exceptions variable before https://github.com/zendframework/zf2/blob/master/library/Zend/Mvc/View/Http/RouteNotFoundStrategy.php#L284 (or somewhere else).

The last one is probably the best in order to preserve consistency across the different errors.