From da40fa7b068e21ca85bfb3c9f4cf207f1008bf43 Mon Sep 17 00:00:00 2001
From: Darren Shepherd <darren@rancher.com>
Date: Sat, 20 Jan 2018 23:23:24 -0700
Subject: [PATCH] don't validate empty string as DNS name

---
 parse/builder/builder.go | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/parse/builder/builder.go b/parse/builder/builder.go
index 3d5070c8..841c339f 100644
--- a/parse/builder/builder.go
+++ b/parse/builder/builder.go
@@ -259,14 +259,17 @@ func (b *Builder) convert(fieldType string, value interface{}, op Operation) (in
 	case "string":
 		return convert.ToString(value), nil
 	case "dnsLabel":
-		value := convert.ToString(value)
+		str := convert.ToString(value)
+		if str == "" {
+			return "", nil
+		}
 		if op == Create || op == Update {
-			if errs := validation.IsDNS1123Subdomain(convert.ToString(value)); len(errs) != 0 {
+			if errs := validation.IsDNS1123Subdomain(str); len(errs) != 0 {
 				return value, httperror.NewAPIError(httperror.InvalidFormat, fmt.Sprintf("invalid value %s: %s", value,
 					strings.Join(errs, ",")))
 			}
 		}
-		return value, nil
+		return str, nil
 	case "intOrString":
 		num, err := convert.ToNumber(value)
 		if err == nil {