fix(dodgeX): do not update series channel if groupBy is invalid (#6344)

* fix(dodgeX): do not update series channel if groupBy is invalid

* fix: ci

README.md

@@ -70,11 +70,11 @@ const chart = new Chart({
 
 // Specify visualization.
 chart
-  .interval()                   // Create an interval mark and add it to the chart.
-  .data(data)                   // Bind data for this mark.
-  .encode('x', 'genre')         // Assign genre column to x position channel.
-  .encode('y', 'sold')          // Assign sold column to y position channel.
-  .encode('color', 'genre');    // Assign genre column to color channel.
+  .interval() // Create an interval mark and add it to the chart.
+  .data(data) // Bind data for this mark.
+  .encode('x', 'genre') // Assign genre column to x position channel.
+  .encode('y', 'sold') // Assign sold column to y position channel.
+  .encode('color', 'genre'); // Assign genre column to color channel.
 
 // Render visualization.
 chart.render();