Bug report

Describe the bug
If we have detections and cell objects and try to run Detection Centroid Distances 2D, it will only output a result for the cells and not the detections.

To Reproduce
Steps to reproduce the behavior:

1. Annotate a small region and use cell detection to create cells (with expansion) and classify them as "Stroma"
2. Annotate another region (It can overlap with the other, but it does not matter) and detect cells without expansion, label them as "Other"
3. Use Detection Centroid Distances 2D with the defaults
4. If you look at the Cell objects, they have a Distance to detection with Stroma um
5. If you look at the Detections (not expanded cells) there is no measurement

If you repeat the steps above but make only Cell objects or Detections without expansion (Where both are of the same type) then it works as expected, meaning both PathObjects have the distance measurements

Expected behavior
I would expect the Detection Centroid Distances 2D would work for heterogeneous groups (cells and detections) as cells are detections too.

Desktop (please complete the following information):

• OS: Win 11
• QuPath Version: 0.5.1