Fix Default Subclass Properties in checkUnset

[lawrence-mbf]

Fixes #470

Motivation

See #470

How to test the behavior?

See #470

Checklist

• Have you ensured the PR description clearly describes the problem and solutions?
• Have you checked to ensure that there aren't other open or previously closed Pull Requests for the same change?
• If this PR fixes an issue, is the first line of the PR description fix #XX where XX is the issue number?

[lawrence-mbf]

Failing tests are fixed in #461

[bendichter]

@lawrence-mbf do you know why these tests are failing? Would it be possible to fix them?

[lawrence-mbf]

@bendichter We're polluting our MatNWB install directory with schemas of other versions. All tests and tutorials should make sure when their code blocks call generateCore they add 'savedir', '.' (generateCore('savedir', '.')) as arguments (saves the generated class files in the current directory which is usually a temporary file) or nwbRead with 'ignorecache' (equivalent to load_namespace=False in pynwb).

As mentioned above, merging in #461 will fix it for the previously added tutorials.

[yarikoptic]

What is the plan for this PR - to be finished up/merged/released?

[lawrence-mbf]

@yarikoptic It can be merged. As mentioned, the test failures are already fixed upstream. Would you say that you approve of these changes?

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@cf16d37). Click here to learn what that means.
The diff coverage is 91.74%.

@@            Coverage Diff            @@
##             master     #475   +/-   ##
=========================================
  Coverage          ?   87.09%           
=========================================
  Files             ?      128           
  Lines             ?     5263           
  Branches          ?        0           
=========================================
  Hits              ?     4584           
  Misses            ?      679           
  Partials          ?        0           

Impacted Files	Coverage Δ
+file/Attribute.m	100.00% <ø> (ø)
+file/Dataset.m	97.26% <ø> (ø)
+file/Group.m	95.00% <ø> (ø)
+file/Link.m	100.00% <ø> (ø)
+file/fillClass.m	100.00% <ø> (ø)
+types/+util/parseConstrained.m	67.74% <67.74%> (ø)
+file/fillConstructor.m	95.72% <95.72%> (ø)
+file/fillProps.m	95.08% <96.55%> (ø)

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