Loss of data object due to generating features

Generate all features, or possibly generating large supervoxels, leads to a memory error or problem resulting in a 'Object 'data' does not exist'.

Recalculating the features or changing the ROI does not seem to fix the problem.

The workspace can be saved in a corrupted state, so the 'object 'data' does not exist' problem keeps reoccuring on reloading that workspace.

Aha! Link: https://dls1.aha.io/features/D-19