ESI processing should ignore responses with no body.

Fixes #318



git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@3193 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache_vrt_esi.c

@@ -635,6 +635,9 @@ VRT_ESI(struct sess *sp)
 		return;
 	}
 
+	if (VTAILQ_EMPTY(&sp->obj->store))
+		return;
+
 	CHECK_OBJ_NOTNULL(sp->obj, OBJECT_MAGIC);
 
 	if (!(params->esi_syntax & 0x00000001)) {

bin/varnishtest/tests/r00318.vtc

+# $Id$
+
+test "ESI with no body in response"
+
+server s1 {
+	rxreq 
+	txresp -status 302
+} -start
+
+varnish v1 -vcl+backend {
+	sub vcl_fetch {
+		esi;
+		pass;
+	}
+} -start
+
+client c1 {
+	txreq 
+	rxresp
+	expect resp.status == 302
+} -run
+