Improve Explode component behaviour when object has some non-retrievable properties

[alelom]

Issues addressed by this PR

Closes #423

Test files

See #423 for the test script.

Before this PR, the script will return an error on the Explode component, returning no output (not even for the retrievable properties).
After this PR, the script should behave as this:

Changelog

Additional comments

[FraserGreenroyd]

@BHoMBot check required

[bhombot-ci]

@FraserGreenroyd to confirm, the following actions are now queued:

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There are 2 requests in the queue ahead of you.

[FraserGreenroyd]

@BHoMBot check copyright-compliance
@BHoMBot check ready-to-merge

[bhombot-ci]

@FraserGreenroyd to confirm, the following actions are now queued:

• check copyright-compliance
• check ready-to-merge

There are 26 requests in the queue ahead of you.

[FraserGreenroyd]

Code changes look sensible, output looks fine on explode component.