Handle the edge case where you slice 0

[liamhuber]

[-0:] is the same as [0:], and radically different for how, e.g. [-1:] vs [1:] works. Derp.

Solves the issue of the entire display getting closed down when you (sometimes) turn off the node representation widget.

Closes the last part of #189

[github-actions]

👈 Launch a binder notebook on branch pyiron/ironflow/display_crashes

[liamhuber]

Run pip check
pyiron-base 0.5.36 has requirement sqlalchemy>=2.0.9, but you have sqlalchemy 1.4.46.
Error: Process completed with exit code 1.

I forgot to un-pin sqlalchemy in the pyiron_ontology conda env file, so I need to go bump that and bump my dependency here too.