Attributes produced by pipelines no longer show up in last few versions

**Describe the bug**
Ran the stereo pipeline (which produces a track attribute "length") and the attributes don't show up in the interface. If I make an attribute 'length' on a given detector in the image sequence, they then show up for all other detections

**To Reproduce**
Run stereo example (load camtrawl imagery data in VIAME examples/example_imagery folder, run only pipeline)
