Raise ValueError if PNG chunks are truncated #6253
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This was referenced Jul 11, 2022
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Resolves #6252
Some PNG chunks expect a certain amount of data.
If the chunk doesn't state that it is long enough to contain that data, then errors can occur, as reported in the issue.
Instead, this PR raises a ValueError. As with other operations in PngImagePlugin,
ImageFile.LOAD_TRUNCATED_IMAGES = Truecan be used to silence these errors.