Fix 'NoneType' has no attribute 'lower' #124
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It's a mystery to me how this passed my local testing. `thumbnail` is an image copy which is [documented](https://pillow.readthedocs.io/en/stable/reference/Image.html#PIL.Image.Image.format) to be None in that case. Retrieve the format property from the originally opened image instead. Closes #123
.. by treating it as a png file, so that the result will be a losslessly compressed version of the original
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It's a mystery to me how this passed my local testing.
thumbnailis an image copy which is documented
to be None in that case.
Retrieve the format property from the originally opened image instead.
Closes #123
@spvkgn please test if you can