[Rubin] [AD] diaObjectId is not always defined #625
Description
diaObject is not always defined. If the object is static, then diaObject is populated by the project, however if the alert is associated to a know asteroid, diaObject is null, and ssSource is populated instead. It is not a problem for the processing itself, as diaObjectId is only use for logging operations.
Maybe it is safer to pass diaSourceId (at the root level and always defined), which is an ID for the source.