fix(use-forward-expose): fix useForwardExpose crash when node is not existed

[Hwacc]

When I was using useForwardExpose in Vue, I found that if an element is bound with forwardRef and the element does not exist at that time, it throws an error and causes a crash.

Here is a simple example to reproduce this issue : https://stackblitz.com/edit/9tedmmel

Steps to reproduce:

1. Click the button to hide the block below.
2. An error message will be printed in the console.

Fixed an incorrect null check order inside the forwardRef function that could cause this crash.

• Just in Vue

[vercel]

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