message: allow csr_row_ptr to be null when nnz == 0
diff: @@ -1705,7 +1705,7 @@ rocsparse_status rocsparse_create_csr_descr(rocsparse_spmat_descr* descr,
  }
  // Check for valid pointers
  - if(rows > 0 && csr_row_ptr == nullptr)
  + if(nnz != 0 && rows > 0 && csr_row_ptr == nullptr)
  {
  return rocsparse_status_invalid_pointer;
  }
  