Handle checkout failure for unbuilt elements

Martin Blanchardrequested to merge
mablanch/447-stack-trace-checkout into master

Description

Trying to checkout an element that has not been build yet (that has no artefact cached yet) leads to a BUG + stack trace.

Changes proposed in this merge request:

  • Raise an ElementError in Element.stage_artifact() if the element has not yet produced an artifact, as suggested by the doctring.
  • Advise on running bst build first as details of the raise exception.
  • Ensure that the exception is caught and that the advice reached the caller.

This merge request, when approved, will close issue/bug: #447 (closed)

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