minor bugfix to test if file is existing when opening in netcdf.py
minor bugfix to test if file is existing when opening in netcdf.py


git-svn-id: https://svn.zmaw.de/svn/pycmbs/trunk@455 46f1e1ae-ddaa-4461-89cc-888b818d8ef3

Former-commit-id: 0828ca94bb7b5671de63adfc92251642e770baa2
Former-commit-id: c0ee9572da79e057a6c61cd20f6a2c770638001e
pygeo/pycmbs,pygeo/pycmbs