rm rnages undefined check

src/index.ts

@@ -813,9 +813,6 @@ abstract class ChartwerkPod<T extends Serie, O extends Options> {
   }
 
   protected zoomIn(ranges: AxisRange[]): void {
-    if(ranges === undefined) {
-      return;
-    }
     this.options.callbackZoomIn(ranges);
   }