check for the correct types

[ajtritt]

Motivation

Fix a bug that was preventing indexing into DynamicTables after read to work properly

[bendichter]

aimed to fix NeurodataWithoutBorders/pynwb#1097?

[codecov]

Codecov Report

Merging #184 into dev will decrease coverage by 0.03%.
The diff coverage is 16.66%.

@@            Coverage Diff             @@
##              dev     #184      +/-   ##
==========================================
- Coverage   70.31%   70.27%   -0.04%     
==========================================
  Files          30       30              
  Lines        5905     5908       +3     
  Branches     1376     1378       +2     
==========================================
  Hits         4152     4152              
- Misses       1321     1323       +2     
- Partials      432      433       +1

Impacted Files	Coverage Δ
src/hdmf/backends/hdf5/h5_utils.py	61.94% <0%> (ø)	⬆️
src/hdmf/common/table.py	53.16% <20%> (-0.45%)	⬇️

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