Exception thrown when accessing Application Registry.

Issue

An exception is thrown when accessing the Application Registry and the Application Registry does not render.

ERROR [PortletApplicationController] Error while rendering the porlet
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at org.exoplatform.webui.Util.createObject(Util.java:63)
    at org.exoplatform.webui.application.WebuiApplication.createUIComponent(WebuiApplication.java:113)
...
Caused by: java.lang.NullPointerException
    at java.lang.String$CaseInsensitiveComparator.compare(String.java:1217)
    at java.lang.String$CaseInsensitiveComparator.compare(String.java:1211)
    at java.lang.String.compareToIgnoreCase(String.java:1258)
    at org.exoplatform.applicationregistry.webui.Util$GadgetComparator.compare(Util.java:70)
    at org.exoplatform.applicationregistry.webui.Util$GadgetComparator.compare(Util.java:65)
    at java.util.Arrays.mergeSort(Arrays.java:1270)
    at java.util.Arrays.mergeSort(Arrays.java:1282)
    at java.util.Arrays.sort(Arrays.java:1210)
    at java.util.Collections.sort(Collections.java:159)
    at org.exoplatform.application.gadget.impl.GadgetRegistryServiceImpl.getAllGadgets(GadgetRegistryServiceImpl.java:175)
    at org.exoplatform.applicationregistry.webui.component.UIGadgetManagement.initData(UIGadgetManagement.java:89)
    at org.exoplatform.applicationregistry.webui.component.UIGadgetManagement.reload(UIGadgetManagement.java:72)
    at org.exoplatform.applicationregistry.webui.component.UIGadgetManagement.<init>(UIGadgetManagement.java:67)
    ... 301 more