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                                            Jingning Zhang

Error of "TypeError: object of type 'NoneType' has no len()" when doing ancestry classification

### What you did: We want to use the ancestry classification tool to predict genetic ancestry of UKBB samples. (https://gnomad.broadinstitute.org/news/2021-09-using-the-gnomad-ancestry-principal-components-analysis-loadings-and-random-forest-classifier-on-your-dataset/) ### What happened: There is an error of "TypeError: object...