fix(ast-spec): a JSXEmptyExpression is not a possible JSXExpression

[MageJohn]

PR Checklist

• Addresses an existing open issue: fixes The JSXExpression union incorrectly includes JSXEmptyExpression #6315
• That issue was marked as accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

As described in the linked issue, a JSXEmptyExpression node is only generated as the child of a JSXExpressionContainer node, and so cannot appear in the same place as a JSXExpression.

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[typescript-eslint]

Thanks for the PR, @MageJohn!

typescript-eslint is a 100% community driven project, and we are incredibly grateful that you are contributing to that community.

The core maintainers work on this in their personal time, so please understand that it may not be possible for them to review your work immediately.

Thanks again!

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[bradzacher]

thanks!