element.py: Only reset Artifact's cachedness when it might change

Jonathan Mawrequested to merge
jonathan/reset_cached_when_needed into master

Description

We were potentially resetting artifact cachedness every time we updated element state. If an artifact wasn't cached, this meant consulting the filesystem every time.

Changes proposed in this merge request:

  • Remove the reset statements from Element.__update_artifact_state
  • Add reset statements to Element._pull_done
  • Add reset statements to Element._assemble_done

This merge request, when approved, will close: #1028 (closed)

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