[Bug]preprocess the LUNA_16 dataset encountered an error

[aiaini66]

:skull: Bug

I printed the variable values at the error location，and found it is the sizes = 0 cased .

Environment

Please provide some information about the used environment. I installed the environment through source.

How was nnDetection installed [docker | source]:

Environment Information:

[paste here]

If necessary, please provide the used run command with all overwrites:

[paste here]