fix: Document.parts() returns [] instead of raising NotImplementedError

[planetf1]

Type of PR

• Bug Fix
• New Feature
• Documentation
• Other

Description

Document.parts() raises NotImplementedError instead of returning an empty list, causing crashes when a Document is passed inside a Message to act()/aact() via generate_walk().

Returns [] to match the pattern used by RichDocument and Table.

Closes #636

Testing

• Tests added to the respective file if code was changed
• New code has 100% coverage if code as added
• Ensure existing tests and github automation passes (a maintainer will kick off the github automation when the rest of the PR is populated)

[mergify]

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[jakelorocco]

lgtm; I think you built off the branch for #619. Not sure if you will have to do anything to resolve that. Please ensure the other one is approved and merged before this one.

[planetf1]

lgtm; I think you built off the branch for #619. Not sure if you will have to do anything to resolve that. Please ensure the other one is approved and merged before this one.

ah. yes - found it when working on the docs & didn't rebase on main

Fixed