clusterName=null causes NPE or hanging at JGroups startup

When configuring the cache programmatic using the GlobalConfigurationBuilder and setting the clustername to null,
causes JGroupsTransport to hang at startup or creating NPE, when JMX is enabled.

e.g.:
Caused by: org.infinispan.CacheException: Unable to invoke method public void org.infinispan.remoting.transport.jgroups.JGroupsTransport.start() on object
at org.infinispan.util.ReflectionUtil.invokeAccessibly(ReflectionUtil.java:236)
at org.infinispan.factories.AbstractComponentRegistry$PrioritizedMethod.invoke(AbstractComponentRegistry.java:875)
at org.infinispan.factories.AbstractComponentRegistry.invokeStartMethods(AbstractComponentRegistry.java:630)
at org.infinispan.factories.AbstractComponentRegistry.internalStart(AbstractComponentRegistry.java:619)
at org.infinispan.factories.AbstractComponentRegistry.start(AbstractComponentRegistry.java:523)
at org.infinispan.factories.GlobalComponentRegistry.start(GlobalComponentRegistry.java:200)
... 32 more
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.infinispan.util.ReflectionUtil.invokeAccessibly(ReflectionUtil.java:234)
... 37 more
Caused by: org.infinispan.CacheException: Channel connected, but unable to register MBeans
at org.infinispan.remoting.transport.jgroups.JGroupsTransport.startJGroupsChannelIfNeeded(JGroupsTransport.java:195)
at org.infinispan.remoting.transport.jgroups.JGroupsTransport.start(JGroupsTransport.java:169)
... 42 more
Caused by: java.lang.NullPointerException
at javax.management.ObjectName.quote(ObjectName.java:1855)
at org.infinispan.remoting.transport.jgroups.JGroupsTransport.startJGroupsChannelIfNeeded(JGroupsTransport.java:189)
... 43 more