From 94cdcd7b34ccc83acfb32be09016cb7859d20916 Mon Sep 17 00:00:00 2001
From: Gu Feng <flygoast@126.com>
Date: Sat, 25 Oct 2014 00:55:49 +0800
Subject: [PATCH] Return an empty <vCard/> element in an IQ-result when no
 vCard exists.

According to XEP-0054, if no vCard exists, the server MUST return a stanza
error (which SHOULD be <item-not-found/>) or an IQ-result containing an
empty <vCard/> element.

Signed-off-by: Gu Feng <flygoast@126.com>
---
 src/mod_vcard.erl | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/mod_vcard.erl b/src/mod_vcard.erl
index 0451a5193..8afac260b 100644
--- a/src/mod_vcard.erl
+++ b/src/mod_vcard.erl
@@ -186,6 +186,11 @@ process_sm_iq(From, To,
 	    error ->
 		IQ#iq{type = error,
 		      sub_el = [SubEl, ?ERR_INTERNAL_SERVER_ERROR]};
+	    [] ->
+		IQ#iq{type = result,
+		      sub_el = [#xmlel{name = <<"vCard">>,
+			        attrs = [{<<"xmlns">>, ?NS_VCARD}],
+			        children = []}]};
 	    Els -> IQ#iq{type = result, sub_el = Els}
 	  end
     end.