Series jobs with no child jobs get stuck on Pending

[nokome]

An example of snapshotting a project with no sources:

- [ ] There should be no "Pull sources" job for a project that has no sources (e.g. a newly created project): pull() should return Optional[Job] (No, because it is useful to see that the job was created albeit empty; adding Optional[Job] return type adds complexity)

• Any series or parallel method job that has no children should succeed immediately (they should not be created but in case they are)

[stencila-ci]

🎉 This issue has been resolved in version 4.35.3 🎉

The release is available on:

• v4.35.3
• GitHub release

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