Ref issue #130 Allow loading netCDF4 package to fail.
Ref issue #130 Allow loading netCDF4 package to fail.

solvcon/solvcon,yungyuc/solvcon,solvcon/solvcon,yungyuc/solvcon,solvcon/solvcon,yungyuc/solvcon,yungyuc/solvcon,solvcon/solvcon,yungyuc/solvcon,solvcon/solvcon,yungyuc/solvcon,solvcon/solvcon