Program throws error when attempting to export a file in a subdirectory

[nus-pe-bot]

Steps to Reproduce

1. Create a file in a subdirectory like tes/abc.txt
2. Add the file add n/tes/abc t/LINKED_LIST
3. Populate the buffer
4. Export

Expected

Either

A) The file is successfully exported in to a subdirectory in the export folder in the same structure or

B) An error is reported when adding the file stating that subdirectories are not supported

Actual

The add is accepted but export fails with the incorrect error message that the file is missing from the root directory

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_{[original: nus-cs2113-AY2223S2/pe-interim#2903] [original labels: type.FunctionalityBug severity.Low]}

[heejet]

Team's Response

This behavior is because files from the .data files can be added.

Duplicate status (if any):

Duplicate of #1244