TypeScript: Print dangling comment in empty type parameters

[sosukesuzuki]

Fixes #7574

// Input
const a: T</* comment */> = 1;

// Prettier stable
Error: Comment "comment" was not printed. Please report this error!
    at https://prettier.io/lib/standalone.js:15543:15
    at Array.forEach (<anonymous>)
    at ensureAllCommentsPrinted (https://prettier.io/lib/standalone.js:15541:17)
    at coreFormat (https://prettier.io/lib/standalone.js:15592:5)
    at format (https://prettier.io/lib/standalone.js:15832:75)
    at formatWithCursor (https://prettier.io/lib/standalone.js:15848:14)
    at https://prettier.io/lib/standalone.js:31794:17
    at Object.format (https://prettier.io/lib/standalone.js:31802:14)
    at formatCode (https://prettier.io/worker.js:234:21)
    at handleMessage (https://prettier.io/worker.js:185:18)

// Prettier master
const a: T</* comment */> = 1;

• I’ve added tests to confirm my change works.
• (If the change is user-facing) I’ve added my changes to changelog_unreleased/*/pr-XXXX.md file following changelog_unreleased/TEMPLATE.md.
• I’ve read the contributing guidelines.

✨Try the playground for this PR✨

[j-f1]

Prettier pr-7729
Playground link

--parser typescript

Input:

const a: T<
  	// comment
  > = 1;

Output:

const a: T<// comment> = 1;

[alexander-akait]

Good job!