This fixes a --check-sex/--impute-sex bug that could result in a spurious ".pgen file read failure" error, and an uninitialized-value-multiplied-by-zero bug that could cause unintended FIRTH_CONVERGE_FAIL errors when the uninitialized value was nan.
This fixes a --check-sex/--impute-sex bug that could result in a spurious ".pgen file read failure" error, and an uninitialized-value-multiplied-by-zero bug that could cause unintended FIRTH_CONVERGE_FAIL errors when the uninitialized value was nan.