Merge pull request SortableJS#1689 from kcak11/master

Added type check for 'dragStarted' variable as this is causing thousa…

Author: owen-m1

plugins/MultiDrag/MultiDrag.js

@@ -467,7 +467,7 @@ function MultiDragPlugin() {
 		},
 
 		_deselectMultiDrag(evt) {
-			if (dragStarted) return;
+			if (typeof dragStarted !== "undefined" && dragStarted) return;
 
 			// Only deselect if selection is in this sortable
 			if (multiDragSortable !== this.sortable) return;