From c5573921b272ce5903b1846fecd6a58e1cb0e6c9 Mon Sep 17 00:00:00 2001
From: Ingo Schwarze <schwarze@openbsd.org>
Date: Fri, 14 Jul 2017 13:32:35 +0000
Subject: do not print <math class="eqn"><mrow></mrow></math> for empty .EQ;
 issue reported by bentley@

---
 eqn_html.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/eqn_html.c b/eqn_html.c
index f569ec2a..51f14423 100644
--- a/eqn_html.c
+++ b/eqn_html.c
@@ -1,4 +1,4 @@
-/*	$Id: eqn_html.c,v 1.16 2017/07/08 14:51:04 schwarze Exp $ */
+/*	$Id: eqn_html.c,v 1.17 2017/07/14 13:32:35 schwarze Exp $ */
 /*
  * Copyright (c) 2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2017 Ingo Schwarze <schwarze@openbsd.org>
@@ -231,6 +231,9 @@ print_eqn(struct html *p, const struct eqn_box *bp)
 {
 	struct tag	*t;
 
+	if (bp->first == NULL)
+		return;
+
 	t = print_otag(p, TAG_MATH, "c", "eqn");
 
 	p->flags |= HTML_NONOSPACE;
-- 
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