Steps to Reproduce: 1) log in as root
2) import all applications
3) create a new page
4) click on 'Gadgets' category in the Page Editor
5) notice error message in the logs
project_key: JBEPP

javax.ws.rs.WebApplicationException when expanding the 'Gadget' category in the Page Editor.

12:48:00,293 ERROR [[RestServer]] Servlet.service() for servlet RestServer threw exception
javax.ws.rs.WebApplicationException
	at org.exoplatform.services.rest.impl.ContainerResponse.writeResponse(ContainerResponse.java:195)
	at org.exoplatform.services.rest.impl.RequestHandlerImpl.handleRequest(RequestHandlerImpl.java:249)
	at org.exoplatform.services.rest.servlet.RestServlet.onService(RestServlet.java:85)
	at org.exoplatform.container.web.AbstractHttpServlet.service(AbstractHttpServlet.java:132)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.exoplatform.services.rest.servlet.RestEncodingFilter.doFilter(RestEncodingFilter.java:58)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.exoplatform.frameworks.jcr.web.ThreadLocalSessionProviderInitializedFilter.doFilter(ThreadLocalSessionProviderInitializedFilter.java:116)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.exoplatform.services.security.web.SetCurrentIdentityFilter.doFilter(SetCurrentIdentityFilter.java:88)