Revert "fix: filter null node first. (#1909)"

This reverts commit 417d066.

Author: Koooooo-7

Diff for: src/core/render/index.js

@@ -260,9 +260,7 @@ export function Render(Base) {
         [
           document.querySelector('aside.sidebar'),
           document.querySelector('button.sidebar-toggle'),
-        ]
-          .filter(e => !!e)
-          .forEach(node => node.parentNode.removeChild(node));
+        ].forEach(node => node.parentNode.removeChild(node));
         document.querySelector('section.content').style.right = 'unset';
         document.querySelector('section.content').style.left = 'unset';
         document.querySelector('section.content').style.position = 'relative';