A-MQ generates ERRORs at shutdown

Issue

When stopping an A-MQ 6.2 instance, the errors below are generated:

It is unclear whether those errors are harmless, and in the best case they are unnecessarily misleading and might raise false alarms through production log monitoring systems.

2015-07-30 17:29:24,977 | ERROR | FelixStartLevel  | HawtioPlugin  | io.hawt.web.plugin.HawtioPlugin    78
 | 197 - io.hawt.hawtio-redhat-fuse-branding - 1.4.0.redhat-133 | Failed to register plugin:
javax.management.InstanceNotFoundException: hawtio:type=plugin,name=hawtio-redhat-fuse-branding
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getMBean(DefaultMBeanServerInterceptor.java:1095)[:1.8.0_45]
        at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.exclusiveUnregisterMBean(DefaultMBeanServerInterceptor.java:427)[:1.8.0_45]

and

2015-07-30 17:29:25,005 | ERROR | FelixStartLevel  | UnregisterWebAppVisitorWC        | ternal.UnregisterWebAppVisitorWC  166 | 185 - org.ops4j.pax.web.pax-web-extender-war - 3.2.3
 | Unregistration exception. Skipping.
java.lang.RuntimeException: javax.management.InstanceNotFoundException: hawtio:type=About
        at io.hawt.HawtioContextListener.createServletException(HawtioContextListener.java:57)[194:io.hawt.hawtio-web:1.4.0.redhat-133]
        at io.hawt.HawtioContextListener.contextDestroyed(HawtioContextListener.java:52)[194:io.hawt.hawtio-web:1.4.0.redhat-133]
        at org.ops4j.pax.web.service.jetty.internal.JettyServerImpl.removeEventListener(JettyServerImpl.java:368)[90:org.ops4j.pax.web.pax-web-jetty:3.2.3]