psautohint
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flattenBlends should test on empty incoming list
blue values or V/H stem list could be empty
https://github.com/adobe-type-tools/psautohint/blob/master/python/psautohint/otfFont.py#L1015
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python3.7/psautohint/otfFont.py", line 1015, in flattenBlends
IndexError: list index out of range