Add a test for individual empty fields within InterlinearSetup

[jasonleenaylor]

In response to the post-approval review question on #238 (#238 (comment)): "What about individual empty children/fields within InterlinearSetup?"

The parser already handles these leniently: an empty string-typed element is preserved as a present-but-empty string (distinct from absent), and an empty boolean element parses as false. No test pinned that behavior, and the 100% branch coverage gate could not force one, because an empty string takes the same defined branch as a populated one and parseBool('') takes the same not-"true" branch as the already-tested "maybe". The new test is the dual of "parses a setup with every field populated": every attribute and child element present but empty, asserting empty strings for string fields and false for booleans.

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[imnasnainaec]

@imnasnainaec reviewed 1 file and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on jasonleenaylor).