test for completely empty datasets (#281)
* test for completely empty datasets * prevents failures with cryptic error message: HDF5-DIAG: Error detected in HDF5 (1.10.4) thread 140737340061504: #000: ../../../src/H5Shyper.c line 7057 in H5Sselect_hyperslab(): hyperslab doesn't support H5S_NULL space
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