Histogram request fails for tiny datasets

[fm3]

If the bounding box of a dataset is tiny (e.g. 50 × 50 × 30 voxel³) the histogram request fails.
The position sampling runs into breaking criterion spaceBetweenWidth < DataLayer.bucketLength already in the first iteration. How can we create a sampling strategy that also returns valid data for arbitrarily small datasets?

[fm3]

We could also discuss if the histogram request failing should cause an error toast at all.
This is a quite prominent error coming up on page load even if the user wasn’t actually intersted in the histogram. The request may still sometimes fail for one reason or the other even after this small-dataset issue is fixed. Do you think we should possibly instead show an error message in place of the histogram in the sidebar? @philippotto @normanrz

[normanrz]

instead show an error message in place of the histogram in the sidebar

That is a good idea. However, I'd rather focus dev work on fixing the histogram computation than the error message :-)