Add deleted in r732 (don't know why) functionality that displays custom Error page when linkname in Developer User Profile url doesn't exist (/site/user/profile/<not_existing_linkname>).
Patch by: Pawel Solyga
Review by: to-be-reviewed
{% 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>