fix memoized render when no callback is defined

src/components/Table/GridTable.tsx

@@ -302,10 +302,13 @@ export function GridTable<R extends Kinded, X extends Only<GridTableXss, X> = an
     // Get the flat list or rows from the header down...
     visibleRows.forEach((rs) => {
       // only pass through events if the row is draggable and the user has provided a callback
-      const dragEventHandler = (callback: OnRowDragEvent<R> | undefined) => (evt: DragEventType) => {
-        if (rs.row.draggable && droppedCallback && callback) {
-          callback({ ...rs.row }, evt);
-        }
+      const dragEventHandler = (callback: OnRowDragEvent<R> | undefined) => {
+        return rs.row.draggable && callback ?
+          (evt: DragEventType) => {
+          if (rs.row.draggable && droppedCallback && callback) {
+            callback({ ...rs.row }, evt);
+          }
+        } : undefined
       };
 
       const onDragStart = (row: GridDataRow<R>, evt: DragEventType) => {