bb_targets and mask_targets may be unbound

[Ertz012]

https://github.com/bit-bots/YOEO/blob/0aaecc2359c619db8f8666b0f3890044308578ba/yoeo/utils/datasets.py#L143C9-L143C55

[jaagut]

On the way I thought about it, and I think making transforms optional is just not necessary. I believe in almost all cases one wants to apply some transforms, at least the default ones. If transforms is not necessary, we leave out the if check and the variables cannot be unbound anymore

[Flova]

I am not sure what the exact problem is? Could you provide additional information? Is it related to batching/transforms when a batch consists only of negative data?