From 236e6682014c60201261c976dc0c6628d93414a5 Mon Sep 17 00:00:00 2001
From: Nick O'Leary <nick.oleary@gmail.com>
Date: Wed, 24 Apr 2024 22:58:11 +0200
Subject: [PATCH] Allow blank strings to be used for env var property
 substitutions Fixes #4663

---
 packages/node_modules/@node-red/runtime/lib/flows/util.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/node_modules/@node-red/runtime/lib/flows/util.js b/packages/node_modules/@node-red/runtime/lib/flows/util.js
index e753075b5..6ec1ef982 100644
--- a/packages/node_modules/@node-red/runtime/lib/flows/util.js
+++ b/packages/node_modules/@node-red/runtime/lib/flows/util.js
@@ -68,7 +68,7 @@ function mapEnvVarProperties(obj,prop,flow,config) {
         if (obj[prop][0] === "$" && (EnvVarPropertyRE_old.test(v) || EnvVarPropertyRE.test(v)) ) {
             const envVar = v.substring(2,v.length-1);
             const r = redUtil.getSetting(config, envVar, flow);
-            if (r !== undefined && r !== '') {
+            if (r !== undefined) {
                 obj[prop] = r
             }
         }