fix: fallback to 72 dpi when image header is 0 (#1494) #1505
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Adds a 72-dpi fallback when an image header declares 0 dpi, preventing the
ZeroDivisionError reported in #1494.
The fix changes two getter methods (
horz_dpi/vert_dpi) and adds aregression test with a 0-dpi JPEG fixture.