Raise ValueError for negative values when loading P1-P3 PPM images #7882
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radarhere
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Helps #7876
Pillow currently raises a ValueError when a value is too large in a P1-P3 PPM image.
Pillow/src/PIL/PpmImagePlugin.py
Lines 273 to 275 in 794a7d6
This adds another ValueError if the value is negative.