[Lens] fix error when adding a new layer (#100766)

Co-authored-by: Kibana Machine <42973632+kibanamachine@users.noreply.github.com>

Author: mbondyra

x-pack/plugins/lens/public/xy_visualization/xy_config_panel.tsx

@@ -140,7 +140,7 @@ const getDataBounds = function (
     let min = Number.MAX_VALUE;
     let max = Number.MIN_VALUE;
     axis.series.forEach((series) => {
-      activeData?.[series.layer].rows.forEach((row) => {
+      activeData?.[series.layer]?.rows.forEach((row) => {
         const value = row[series.accessor];
         if (!Number.isNaN(value)) {
           if (value < min) {