Pedro J. Estébanez 803b3934d6 Fix duplication of signals ...

- Partially revert 6496b53549, adding a comment about why duplications of signals must happen as a second phase.
- Add fallback logic for connections to nodes not in the duplicated hierarchy.
- Remove redundant call to `Node::_duplicate_signals()`.

Fixes #12951.

2017-11-19 15:07:05 +01:00

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