From 01a027184630b29e5ab19cf8fd93b9dcadd6bc8f Mon Sep 17 00:00:00 2001
From: K3rnelPan1c <33120068+h1dden-da3m0n@users.noreply.github.com>
Date: Sun, 14 Nov 2021 17:51:48 +0100
Subject: [PATCH] fix doTestConfiguration for displayExpression

---
 .../plugins/restlistparam/RestListParameterDefinition.java      | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/io/jenkins/plugins/restlistparam/RestListParameterDefinition.java b/src/main/java/io/jenkins/plugins/restlistparam/RestListParameterDefinition.java
index 98f2c7c..27be896 100644
--- a/src/main/java/io/jenkins/plugins/restlistparam/RestListParameterDefinition.java
+++ b/src/main/java/io/jenkins/plugins/restlistparam/RestListParameterDefinition.java
@@ -393,7 +393,7 @@ public FormValidation doTestConfiguration(@AncestorInPath final Item context,
         mimeType,
         0,
         valueExpression,
-        displayExpression,
+        StringUtils.isNotBlank(displayExpression) ? displayExpression : "$",
         filter,
         valueOrder);