From a80bdb570af19504bf76dcfb43199ee123ffddb0 Mon Sep 17 00:00:00 2001
From: Lokesh Gopu <logopu@microsoft.com>
Date: Tue, 14 Apr 2020 12:08:07 -0400
Subject: [PATCH] Fix optional parameter for unattended

---
 src/Runner.Listener/Configuration/PromptManager.cs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Runner.Listener/Configuration/PromptManager.cs b/src/Runner.Listener/Configuration/PromptManager.cs
index 274a24878..3b765ef82 100644
--- a/src/Runner.Listener/Configuration/PromptManager.cs
+++ b/src/Runner.Listener/Configuration/PromptManager.cs
@@ -72,6 +72,10 @@ namespace GitHub.Runner.Listener.Configuration
                 {
                     return defaultValue;
                 }
+                else if (isOptional) 
+                {
+                    return string.Empty;
+                }
 
                 // Otherwise throw.
                 throw new Exception($"Invalid configuration provided for {argName}. Terminating unattended configuration.");