Bluescreen cannot render when magic `__isset` on rendered exception throws another exception

[kukulich]

Version: 2.5.0

Bug Description

Bluescreen cannot render when magic __isset on rendered exception throws another exception.

The problematic code is:

if (!empty($ex->tracyAction['link']) && !empty($ex->tracyAction['label'])) {
	$actions[] = $ex->tracyAction;
}

Steps To Reproduce

Try to render this exception:

class FooException extends Exception
{
	public function __isset($name)
	{
                throw new Exception('Isset is disabled');
	}    
}

Possible Solution

There should be an interface to detect exceptions with actions.