On Study View comparing groups after filtering excludes NAs

[inodb]

See:

Step 1: https://www.cbioportal.org/study/summary?id=coadread_tcga_pub

Step 2:

But in GENIE portal it does create an NA group, see e.g.:

https://genie.cbioportal.org/comparison?comparisonId=64ac5689a9c90a1e68bf0887

Not sure if the NAs in GENIE are different somehow or if this is a bug