Fix treatment of @DefaultValue for missing @PathParam

    public static class PathBeanParamEntity {
       @PathParam("p") String p;
    }

    @Path("test")
    public static class Resource {
       @BeanParam PathBeanParamEntity pbpe;

       @Path("get") @GET String method() {}
    }

If this annotation is not used and the corresponding meta-data is not present in the request, the value will be an empty collection for List, Set or SortedSet, null for other object types, and the Java-defined default for primitive types.