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]

@BHoMBot check required

[bhombot-ci[bot]]

@pawelbaran to confirm, the following actions are now queued: - check `code-compliance` - check `documentation-compliance` - check `project-compliance` - check `core` - check `null-handling` - check `serialisation` - check `versioning` - check `installer` There are 17 requests in the queue ahead of you.

[FraserGreenroyd]

@BHoMBot check compliance @BHoMBot check unit-tests @BHoMBot check serialisation

[bhombot-ci[bot]]

@FraserGreenroyd to confirm, the following actions are now queued: - check `code-compliance` - check `documentation-compliance` - check `project-compliance` - check `branch-compliance` - check `dataset-compliance` - check `copyright-compliance` - check `unit-tests` - check `serialisation`

[bhombot-ci[bot]]

The check `code-compliance` has already been run previously and recorded as a successful check. This check has not been run again at this time.

[bhombot-ci[bot]]

The check `documentation-compliance` has already been run previously and recorded as a successful check. This check has not been run again at this time.

[FraserGreenroyd]

@BHoMBot check ready-to-merge

[bhombot-ci[bot]]

@FraserGreenroyd to confirm, the following actions are now queued: - check `ready-to-merge` There are 18 requests in the queue ahead of you.