File_Adapter: verify if file's attributes exist before attempting to use them to decide whether to read it or not

[alelom]

Issues addressed by this PR

Closes #168

Test files

See #168

Changelog

Additional comments

[pawelbaran]

Code reviewed and tested - happy to approve! 👍

[pawelbaran]

@BHoMBot check required

[bhombot-ci]

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[FraserGreenroyd]

@BHoMBot check compliance
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[bhombot-ci]

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[FraserGreenroyd]

@BHoMBot check ready-to-merge

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