Dev-branch: Bug in `load_waveforms` for `waveforms_extractor_backwards_compatibility.py`

[zm711]

https://github.com/SpikeInterface/spikeinterface/blob/69d1f9a3db9ada72812204ca25012efec5c1ff40/src/spikeinterface/core/waveforms_extractor_backwards_compatibility.py#L334-L342

This fails because it returns the function which evaluates as truth-y

It should be

(folder / "spikeinterface_info.json").exists():

This evaluated as true and then failed in one of my datasets.

cc: @alejoe91 @samuelgarcia

[alejoe91]

Good catch!

[samuelgarcia]

Thanks. I fix it in #2502