When discovery URL is not set, "Software/Updates" page is silently hidden

!SESSION 2014-11-21 15:51:47.555 -----------------------------------------------
eclipse.buildId=unknown
java.version=1.8.0_11
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US
Framework arguments:  -product com.jboss.devstudio.core.product
Command-line arguments:  -os linux -ws gtk -arch x86_64 -product com.jboss.devstudio.core.product

!ENTRY org.jboss.tools.project.examples 4 0 2014-11-21 15:53:24.762
!MESSAGE All attempts to discover connectors have failed
!SUBENTRY 1 org.eclipse.mylyn.discovery.core 4 0 2014-11-21 15:53:24.762
!MESSAGE Failed to get connectors from RemoteProxyWizardDiscoveryStrategy
!STACK 0
java.lang.NullPointerException
	at java.net.URI$Parser.parse(URI.java:3042)
	at java.net.URI.<init>(URI.java:588)
	at org.jboss.tools.project.examples.internal.discovery.xpl.RemoteExternalBundleDiscoveryStrategy.loadRegistry(RemoteExternalBundleDiscoveryStrategy.java:90)
	at org.jboss.tools.project.examples.internal.discovery.xpl.ExternalBundleDiscoveryStrategy.performDiscovery(ExternalBundleDiscoveryStrategy.java:117)
	at org.jboss.tools.project.examples.internal.discovery.ChainedDiscoveryStrategy.performDiscovery(ChainedDiscoveryStrategy.java:62)
	at org.eclipse.mylyn.internal.discovery.core.model.ConnectorDiscovery.performDiscovery(ConnectorDiscovery.java:114)
	at org.jboss.tools.central.internal.discovery.wizards.ProxyWizardManager.loadWizards(ProxyWizardManager.java:107)
	at org.jboss.tools.central.internal.discovery.wizards.ProxyWizardUpdateJob.run(ProxyWizardUpdateJob.java:45)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)