_yaml.py, source.py: Fix tracking of refs inside conditions

Daniel Silverstonerequested to merge
danielsilverstone-ct/track-update into master

Description

This fixes a situation where you might have had an element of the form:

kind: import

sources:
- kind: git
  (?):
  - cheese:
      url: git://git.gitano.org.uk/gitano.git
      track: master
      ref: 78a5caf1e619dca3924feed74a03291c2e651c34
  - not cheese:
      url: http://git.gitano.org.uk/gall.git
      track: master
      ref: 43816e976ca1008bad55ed5e01974e0709980418

If you did bst source track test.bst you'd get a new ref: ... at the top level of the source entry.

Changes proposed in this merge request:

  • Fix the above

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