Bug 5841: Routing slip not displaying publication date

Bug 5841: Routing slip not displaying publication date

To test:
Compare output of the 2 different links for  printing routing lists.

1) Links in the table of issues on the serial collection page
2) Link following the steps from editing and saving a routing list

Both previews should show the date now.

Signed-off-by: Kristina D.C. Hoeppner <kristina@catalyst.net.nz>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>