if one Adds the ImageSet out of order, the data manager doesnt have all the image sets

[twongjirad]

If you do something like:

...
_alg_mgr.Add(img, meta, larocv::ImageSetID_t::kImageSetWire);
_alg_mgr.Add(img, meta, larocv::ImageSetID_t::kImageSetShower);
_alg_mgr.Add(img, meta, larocv::ImageSetID_t::kImageSetTrack);
...

This adds the image sets with IDs {0,2,1}. Running the algo chain, an algo complained that no SetID=2 was found. Adding in SetID=1 (tracks) probably cleared the images in SetID=2 (shower).

Not urgent at the moment, but might want to change this behavior at some point.