Throw error on export if required dependent properties are missing

[ehennestad]

Motivation

Some properties are only required in the presence of other properties. For example, the source_script is an optional dataset of an NWBFile, but the file_name attribute is required. Therefore, if the source_script property of an NWBFile object has a value, the source_script_file_name property is required in the NWBFile.

Schema definition:
https://github.com/NeurodataWithoutBorders/nwb-schema/blob/f9fb35fb18b55444bfef45869133b6039c730df4/core/nwb.file.yaml#L236-L243

This PR throws an error on export if such a required dependent property is empty.

How to test the behavior?

nwbFile = NwbFile( ...
    'session_description', 'test file for nwb export', ...
    'identifier', 'export_test', ...
    'session_start_time', datetime("now", 'TimeZone', 'local') );

fileName = "testExportWithMissingRequiredDependentProperty";

% Should work without error
nwbExport(nwbFile, fileName + "_1.nwb")

% Now we add a value to the "general_source_script" property. This
% is a dataset with a required attribute called "file_name".
% Hence, the property "general_source_script_file_name" becomes
% required when we add a value to the "general_source_script"
% property.
nwbFile.general_source_script = '.../nwbExportTest.m';

% Exporting should now throw an error
nwbExport(nwbFile, fileName + "_2.nwb")

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?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.39%. Comparing base (faa4e59) to head (f3f387d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #667      +/-   ##
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- Coverage   95.39%   95.39%   -0.01%     
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  Files         137      137              
  Lines        5276     5274       -2     
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- Hits         5033     5031       -2     
  Misses        243      243              

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