After I upgraded a plugin to a new version, hudson fails to load up after beeing
restarted. The error log contains the following infos:

==> /var/log/hudson/err.log <==
Apr 16, 2008 12:00:14 PM hudson.TcpSlaveAgentListener <init>
INFO: JNLP slave agent listener started on TCP port 33428
Apr 16, 2008 12:00:14 PM hudson.WebAppMain$2 run
SEVERE: Failed to initialize Hudson
java.lang.NullPointerException
at hudson.model.Project.updateTransientActions(Project.java:162)
at hudson.model.AbstractProject.onLoad(AbstractProject.java:166)
at hudson.model.Project.onLoad(Project.java:61)
at hudson.model.Items.load(Items.java:80)
at hudson.model.Hudson.load(Hudson.java:1268)
at hudson.model.Hudson.<init>(Hudson.java:346)
at hudson.WebAppMain$2.run(WebAppMain.java:155)
Exception in thread "hudson initialization thread" java.lang.NullPointerException
at hudson.model.Project.updateTransientActions(Project.java:162)
at hudson.model.AbstractProject.onLoad(AbstractProject.java:166)
at hudson.model.Project.onLoad(Project.java:61)
at hudson.model.Items.load(Items.java:80)
at hudson.model.Hudson.load(Hudson.java:1268)
at hudson.model.Hudson.<init>(Hudson.java:346)
at hudson.WebAppMain$2.run(WebAppMain.java:155)

When opening the webui it shows the "hudson loading ..." text and refreshs it
every few seconds. There is no info that an error occured and you should take a
look at the server.

Furthermore it would be nice to have a button for restarting the loading
procedure in such a state so I don't have to restart the whole server.

Wished actions:
1. If any exception occures while loading: show it on the index page or give a
hint that an exception occured.
2. Add a button with the same effect as the 'reload config from disc' in the
manage hudson page.