fix test r00913.vtc -- only in match() will we treat strings to be

match as "" when NULL, to correspond with the Varnish native regexen

src/tests/r00913.vtc

 # looks like -*- vcl -*-
 
-varnishtest "test null match (varnish r00913.vtc)"
+varnishtest "test null and empty match"
 
 server s1 {
 	rxreq
@@ -25,26 +25,23 @@ varnish v1 -vcl+backend {
 
 	sub vcl_backend_response {
 		if (end.match(beresp.http.bar)) {
-			set beresp.http.foo = "XXX";
+			set beresp.http.end = "XXX";
 		}
-		if (empty.match(beresp.http.foo)) {
-			set beresp.http.bar = "YYY";
+		if (empty.match(beresp.http.bar)) {
+			set beresp.http.empty = "YYY";
 		}
 		if (endset.match(beresp.http.bar)) {
-			set beresp.http.foos = "XXX";
+			set beresp.http.ends = "XXX";
 		}
-		if (emptyset.match(beresp.http.foo)) {
-			set beresp.http.bars = "YYY";
+		if (emptyset.match(beresp.http.bar)) {
+			set beresp.http.emptys = "YYY";
 		}
 		if (re2.match("$", beresp.http.bar)) {
-			set beresp.http.foof = "XXX";
+			set beresp.http.endf = "XXX";
 		}
-		if (re2.match("", beresp.http.foo)) {
-			set beresp.http.barf = "YYY";
+		if (re2.match("", beresp.http.bar)) {
+			set beresp.http.emptyf = "YYY";
 		}
-		# Tests for sub() with regex "$" are in sub.vtc
-		set beresp.http.barsub = empty.sub(beresp.http.foo, "YYY");
-		set beresp.http.barsubf = re2.sub("", beresp.http.foo, "YYY");
 	}
 } -start
 
@@ -52,12 +49,10 @@ client c1 {
 	txreq
 	rxresp 
 	expect resp.status == 200
-	expect resp.http.foo == "XXX"
-	expect resp.http.bar == "YYY"
-	expect resp.http.foos == "XXX"
-	expect resp.http.bars == "YYY"
-	expect resp.http.foof == "XXX"
-	expect resp.http.barf == "YYY"
-	expect resp.http.barsub == "YYYXXX"
-	expect resp.http.barsubf == "YYYXXX"
+	expect resp.http.end == "XXX"
+	expect resp.http.empty == "YYY"
+	expect resp.http.ends == "XXX"
+	expect resp.http.emptys == "YYY"
+	expect resp.http.endf == "XXX"
+	expect resp.http.emptyf == "YYY"
 } -run