<p>Thanks for finding this, looks like a copy&paste issue, so I think the condition should not be removed but fixed -- instead of:</p>
<pre><code>if(subs->extra_headers && hentity->extra_headers->s)
</code></pre>
<p>There should be:</p>
<pre><code>if(subs->extra_headers && subst->extra_headers->s)
</code></pre>

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