_stream.py: fix _buildtree_pull_required logic

Tom Pollardrequested to merge
tpollard/fixbuildtreereq into master

Description

Whilst testing new functionality for optional buildtree pushing I realised the if logic for returning the empty list was incorrect as a NOR

Changes proposed in this merge request:

  • Return empty list if not set to pull buildtrees or no fetch remotes available

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