fix(tooltip): fix potential NPE when the parent node of the tooltip e…

…lement doesn't exist (#19265)

* fix(tooltip): use `remove` rather than `parentNode.removeChild` to fix potential NPE when its parent node doesn't exists. (#19248)

* fix(tooltip): clearTimeout when disposing

* fix(tooltip): still use `parentNode.removeChild` to reserve support for IE.

src/component/tooltip/TooltipHTMLContent.ts

@@ -520,7 +520,11 @@ class TooltipHTMLContent {
     }
 
     dispose() {
-        this.el.parentNode.removeChild(this.el);
+        clearTimeout(this._hideTimeout);
+        clearTimeout(this._longHideTimeout);
+
+        const parentNode = this.el.parentNode;
+        parentNode && parentNode.removeChild(this.el);
         this.el = this._container = null;
     }