Fix variance check for single-samples

[smlmbrt]

pgscatalog_utils/pgscatalog_utils/ancestry/tools.py

Lines 250 to 253 in b5962bf

	# Check that PGS has variance (e.g. not all 0)
	if 0 in [np.var(results_ref[sum_col]), np.var(results_target[sum_col])]:
	scorecols_drop.add(c_pgs)
	logger.warning("Skipping adjustment: {} has 0 variance in PGS SUM".format(c_pgs))

Related to: PGScatalog/pgsc_calc#283

[smlmbrt]

Fixed in: PGScatalog/pygscatalog@b69e9f5