JMX - exceptions are ignored

Fix of KARAF-6654 causes all JMX operations to hide exceptions thrown to client. In other words, whenever I call karaf operation via JMX, and an exception is thrown, I do not see this exception happening.

Reason is this code by ffang in org.apache.karaf.management.internal.MBeanInvocationHandler:

try {
    return method.invoke(wrapped, args);
} catch (InvocationTargetException e) {
    return null;
}

It does exactly what it says, ignores the exception and returns null. My JMX client gets the null value, and no exception.