cleanup: polyfill assertRaisesRegex so we can avoid assertRaisesRegexp
The latter is deprecated on Python 3.7 and causes our tests to fail
due to the warning.
Differential Revision: https://phab.mercurial-scm.org/D3375
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<title>{repo|escape}: Error</title>
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<link rel="alternate" type="application/rss+xml" href="{url|urlescape}rss-log" title="RSS feed for {repo|escape}"/>
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<body>
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<h1 class="breadcrumb"><a href="/">Mercurial</a> {pathdef%breadcrumb} / not found: {repo|escape}</h1>
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<h2 class="no-link no-border">An error occurred while processing your request</h2>
<p class="normal">{error|escape}</p>
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