Prevent zero underflow in volume (#437) #637

Job	Run time
Check Manifest	18s
Check Linting	18s
Run brainmapper tests to check for breakages	7m 37s
Run package tests (ubuntu-latest, 3.10)	6m 39s
Run tests with numba disabled	27m 44s
Run package tests (ubuntu-latest, 3.11)	6m 49s
Run package tests (ubuntu-latest, 3.12)	8m 15s
Run package tests (macos-13, 3.12)	8m 36s
Run package tests (macos-latest, 3.12)	4m 39s
Run package tests (windows-latest, 3.12)	9m 21s
Build source distribution and wheel	0s
Publish build distributions	0s
	1h 20m 16s

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