Fix bug for h5group.root

[hkchekc]

Originally the function won't work, now we can get nix Blocks or Sections from h5group. Probably need some test

[lgtm-com]

This pull request fixes 1 alert when merging 8917e51 into b19e5ad - view on LGTM.com

fixed alerts:

• 1 for Wrong number of arguments in a class instantiation

[achilleas-k]

Looks good. Will merge when tests finish.

[lgtm-com]

This pull request fixes 1 alert when merging 3ca2484 into ed22c88 - view on LGTM.com

fixed alerts:

• 1 for Wrong number of arguments in a class instantiation

[btel]

Codecov Report

Merging #434 into master will decrease coverage by 0.01%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #434      +/-   ##
==========================================
- Coverage   90.42%   90.41%   -0.02%     
==========================================
  Files          55       55              
  Lines        7090     7091       +1     
==========================================
  Hits         6411     6411              
- Misses        679      680       +1     

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