Merge branch 'devel' of github.com:ESGF/esgf-web-fe into devel
Merge branch 'devel' of github.com:ESGF/esgf-web-fe into devel
Datacart fix:

Datasets with files that were published with no tracking id or checksum values could not be displayed.  This was fixed by allowing null values and displaying N/A in those cases