edpsciences_package: attach fulltext fix

* Modifies _attach_fulltext function to handle url timeout errors
  and retries to open the url 10 times.

Signed-off-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>
jats_package: empty affiliation fix

* Handles the case of empty affiliations.

Signed-off-by: Georgios Papoutsakis <georgios.papoutsakis@cern.ch>