[master] 6a394677d Slightly improve return; coverage

[Dridi Boukelmoune]

commit 6a394677d8d509d778a4632dd156317c0523f874
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Tue Dec 17 14:06:37 2019 +0100

    Slightly improve return; coverage

diff --git a/bin/varnishtest/tests/v00034.vtc b/bin/varnishtest/tests/v00034.vtc
index 4367444a3..44846a3ec 100644
--- a/bin/varnishtest/tests/v00034.vtc
+++ b/bin/varnishtest/tests/v00034.vtc
@@ -46,4 +46,5 @@ client c1 {
 	txreq
 	rxresp
 	expect resp.http.foo == "foo"
+	expect resp.http.bar == <undef>
 } -run