Move no prediction

[SkepticRaven]

Moves the location of where "no prediction" is applied.

Handling of removing predictions when poses are invalid prior to these changes was applied in 2 separate locations:

1. classification thread in UI between making predictions and saving them
2. classification logic in cli between making predictions and saving them

Blanking predictions after these changes is now owned by the classifier's predict and predict_proba methods.

[gbeane]

This is failing our ruff format and linting checks

@SkepticRaven please run
ruff check src and fix any issues followed by ruff format src