The primary address is never null.
If no alias is set, the id is returned.
To still easily get the primary alias, the complete Alias DTOs
are now included in the metadata.
Signed-off-by: David Mehren <git@herrmehren.de>
To make the create method more consistent with the
guidelines,
this commit removes the default value from the `primary` parameter.
Signed-off-by: David Mehren <git@herrmehren.de>
