From 86f45944116e37fc9a50b37618e8a5665f3f8d0d Mon Sep 17 00:00:00 2001
From: Patrick Hallisey <pahallis@microsoft.com>
Date: Mon, 3 Mar 2025 08:51:56 -0800
Subject: [PATCH] Handle empty yaml variable in interpolated string (#48494)

---
 eng/pipelines/templates/jobs/ci.yml | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/eng/pipelines/templates/jobs/ci.yml b/eng/pipelines/templates/jobs/ci.yml
index 093a5e266353..71e94ef13cd5 100644
--- a/eng/pipelines/templates/jobs/ci.yml
+++ b/eng/pipelines/templates/jobs/ci.yml
@@ -145,11 +145,14 @@ jobs:
           displayName: "Build and Package for PR"
       - ${{ else }}:
         - pwsh: |
-            if (Test-Path "$(ProjectListOverrideFile)") {
-              Write-Host "Clearing $(ProjectListOverrideFile)"
-              rm "$(ProjectListOverrideFile)"
-              Write-Host "##vso[task.setvariable variable=ProjectListOverrideFile;]"
+            $variableSet = $env:ProjectListOverrideFile -ne "`$`(ProjectListOverrideFile`)"
+            if ($variableSet -and (Test-Path $env:ProjectListOverrideFile)) {
+              Write-Host "Clearing $env:ProjectListOverrideFile"
+              rm $env:ProjectListOverrideFile
             }
+            Write-Host '##vso[task.setvariable variable=ProjectListOverrideFile;]'
+          env:
+            ProjectListOverrideFile: $(ProjectListOverrideFile)
           displayName: Cleanup Props File
 
         - script: >-