fix: getHeight crash when item removed

fix ant-design/ant-design#20874

Author: zombieJ

package.json

@@ -2,6 +2,9 @@
   "name": "rc-virtual-list",
   "version": "0.0.0-rc.0",
   "description": "React Virtual List Component",
+  "engines": {
+    "node": ">=8.x"
+  },
   "keywords": [
     "react",
     "react-component",

src/utils/itemUtil.ts

@@ -81,7 +81,8 @@ export function getElementScrollPercentage(element: HTMLElement | null) {
  * But if not provided, downgrade to `findDOMNode` to get the real dom element.
  */
 export function getNodeHeight(node: HTMLElement) {
-  return findDOMNode(node).offsetHeight;
+  const element = findDOMNode(node);
+  return element ? element.offsetHeight : 0;
 }
 
 /**