fix(compile-sfc): remove optional check

[jineshjin]

npx depcheck was failing with latest version

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[liulinboyi]

Starting with v3.2.34-beta.1, the compiled product is es2020, which requires node version node 14+ and uses new javascript features such as ?..

Related commit build: output es2020 (target node 14+) for cjs/server builds.

[jineshjin]

Already checking here https://github.com/vuejs/core/blob/main/packages/compiler-sfc/src/rewriteDefault.ts#L54
so is that needed?

[liulinboyi]

Already checking here https://github.com/vuejs/core/blob/main/packages/compiler-sfc/src/rewriteDefault.ts#L54 so is that needed?

You are right, it is not necessary.

[yyx990803]

fixed via cf55480

[zhmushan]

@yyx990803 This PR is not intended to fix the problem that Nodejs12 cannot run, but to remove unnecessary optional check.

[yyx990803]

The optional chaining is unnecessary, but the intention was to fix the syntax in Node 12.

This can be merged as a refactor/chore but not a fix.