mandoc: do not access a NULL pointer when formatting a completely empty

mandoc: do not access a NULL pointer when formatting a completely empty

[schwarze]

Log Message:
-----------
do not access a NULL pointer when formatting a completely empty document

Modified Files:
--------------
    mandoc:
        man_html.c
        mdoc_html.c

Revision Data
-------------
Index: mdoc_html.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/mdoc_html.c,v
retrieving revision 1.325
retrieving revision 1.326
diff -Lmdoc_html.c -Lmdoc_html.c -u -p -r1.325 -r1.326
--- mdoc_html.c
+++ mdoc_html.c
@@ -1,7 +1,7 @@
 /*	$Id$ */
 /*
  * Copyright (c) 2008-2011, 2014 Kristaps Dzonsons <kristaps@bsd.lv>
- * Copyright (c) 2014,2015,2016,2017,2018 Ingo Schwarze <schwarze@openbsd.org>
+ * Copyright (c) 2014-2019 Ingo Schwarze <schwarze@openbsd.org>
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -294,7 +294,7 @@ html_mdoc(void *arg, const struct roff_m
 	if ((h->oflags & HTML_FRAGMENT) == 0) {
 		print_gen_decls(h);
 		print_otag(h, TAG_HTML, "");
-		if (n->type == ROFFT_COMMENT)
+		if (n != NULL && n->type == ROFFT_COMMENT)
 			print_gen_comment(h, n);
 		t = print_otag(h, TAG_HEAD, "");
 		print_mdoc_head(mdoc, h);
Index: man_html.c
===================================================================
RCS file: /home/cvs/mandoc/mandoc/man_html.c,v
retrieving revision 1.168
retrieving revision 1.169
diff -Lman_html.c -Lman_html.c -u -p -r1.168 -r1.169
--- man_html.c
+++ man_html.c
@@ -119,7 +119,7 @@ html_man(void *arg, const struct roff_me
 	if ((h->oflags & HTML_FRAGMENT) == 0) {
 		print_gen_decls(h);
 		print_otag(h, TAG_HTML, "");
-		if (n->type == ROFFT_COMMENT)
+		if (n != NULL && n->type == ROFFT_COMMENT)
 			print_gen_comment(h, n);
 		t = print_otag(h, TAG_HEAD, "");
 		print_man_head(man, h);
--
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