From a4b63d2dc0ced54196f0ac69fe040246b7579090 Mon Sep 17 00:00:00 2001
From: Daniel Beck <daniel-beck@github.com>
Date: Mon, 19 May 2014 22:27:39 +0200
Subject: [PATCH] [FIXED JENKINS-20031] Useful error message when UC not found

---
 core/src/main/java/hudson/PluginManager.java | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/core/src/main/java/hudson/PluginManager.java b/core/src/main/java/hudson/PluginManager.java
index e1342b4ce1..192193eb6e 100644
--- a/core/src/main/java/hudson/PluginManager.java
+++ b/core/src/main/java/hudson/PluginManager.java
@@ -721,7 +721,9 @@ public abstract class PluginManager extends AbstractModelObject implements OnMas
                     String pluginName = n.substring(0, index);
                     String siteName = n.substring(index + 1);
                     UpdateSite updateSite = Jenkins.getInstance().getUpdateCenter().getById(siteName);
-                    if (siteName != null) {
+                    if (updateSite == null) {
+                        throw new Failure("No such update center: " + siteName);
+                    } else {
                         UpdateSite.Plugin plugin = updateSite.getPlugin(pluginName);
                         if (plugin != null) {
                             if (p != null) {