fix bug if multiple years and one has no files
fix bug if multiple years and one has no files

git-svn-id: https://beagle.whoi.edu/svn/ifcb/trunk@1389 9f5e5bc8-6430-4f94-ad00-aad15e9f9366

Former-commit-id: e516ea7b964c2ad98298c2e9278a6ff09893bb7e
hsosik/ifcb-analysis,hsosik/ifcb-analysis,hsosik/ifcb-analysis,hsosik/ifcb-analysis,hsosik/ifcb-analysis