Use params['logic'] instead of self._logic
This makes it possible to specify a different logic for each view.
Patch by: Sverre Rabbelier
{% comment %}
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{% endcomment %}
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
<html lang="en">
<head>
<title>500 Server Error</title>
</head>
<body><h1>500 Server Error</h1></body>
</html>