hdf5_ep

Merge pull request #2043 in HDFFV/hdf5 from ~NFORTNE2/hdf5_naf:seq_list_fix to develop

* commit 'c104f4cb87a1558ab6a772967887738dc9800f0d':
  Modify H5Ssel_iter_get_seq_list() to accept iterators that have reached the end of iteration (returning zero sequences).  Previously it could cause an assertion failure.