npbackend: added a indexing with array check in GetItem(), which fixes #1 and fixes #13
npbackend: added a indexing with array check in GetItem(), which fixes #1 and fixes #13

bh107/bohrium,madsbk/bohrium,bh107/bohrium,madsbk/bohrium,bh107/bohrium,bh107/bohrium,madsbk/bohrium,madsbk/bohrium