return
	}

	// Check if config param requested is valid.
	defKVS, ok := DefaultKVS[subSys]
	if !ok {
		return
	}

	defValue, isFound := defKVS.Lookup(cfgParam)
	// Comments usually are absent from `defKVS`, so we handle it specially.
	if !isFound && cfgParam == Comment {
		defValue, isFound = "", true
	}
	if !isFound {
		return
	}

	if target == "" {
		target = Default
	}