vispy / vispy / 10848415194

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fix: prevent zerodiv error when auto-calculating clims in scalable textures (#2621)

small change here. I very frequently hit a ZeroDivisionError with
scaling in vispy:

```python
  File "/Users/talley/dev/self/orGANelle/.venv/lib/python3.12/site-packages/vispy/visuals/visual.py", line 505, in draw
    if self._prepare_draw(view=self) is False:
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/talley/dev/self/orGANelle/.venv/lib/python3.12/site-packages/vispy/visuals/image.py", line 677, in _prepare_draw
    self._build_texture()
  File "/Users/talley/dev/self/orGANelle/.venv/lib/python3.12/site-packages/vispy/visuals/image.py", line 613, in _build_texture
    pre_clims = self._texture.clim_normalized
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/talley/dev/self/orGANelle/.venv/lib/python3.12/site-packages/vispy/visuals/_scalable_textures.py", line 296, in clim_normalized
    clim_min = (clim_min - range_min) / (range_max - range_min)
               ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
ZeroDivisionError: float division by zer
```

I could of course try to check ahead of time to prevent asking vispy to
autoscale something where the min and max value are the same, but this
small change also catches it and works in all the cases i tried. let me
know if you see any problems with it

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