fixed #536 "Hudson fails on first startup"

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@3285 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/model/Hudson.java

@@ -890,7 +890,10 @@ public final class Hudson extends View implements ItemGroup<TopLevelItem>, Node
         if(pluginManager!=null) // be defensive. there could be some ugly timing related issues
             pluginManager.stop();
 
-        getQueue().save();
+        if(getRootDir().exists())
+            // if we are aborting because we failed to create HUDSON_HOME,
+            // don't try to save. Issue #536
+            getQueue().save();
     }