[ts-ast-viewer] Some invalid inputs print errors in AST factory panel

[Andarist]

Describe the bug

Version: X.X.X

To Reproduce

Use the code below

type Mapped<T> = {
    []
}

To see the error like:

Something went wrong
TypeError: Cannot read properties of undefined (reading 'kind')

    at bpe (https://ts-ast-viewer.com/assets/index.561569ce.js:50:6354)
    at Z7 (https://ts-ast-viewer.com/assets/index.561569ce.js:50:5545)
    at div
    at https://ts-ast-viewer.com/assets/index.561569ce.js:44:38513
    at div
    at div
    at https://ts-ast-viewer.com/assets/index.561569ce.js:44:38690
    at div
    at https://ts-ast-viewer.com/assets/index.561569ce.js:44:38513
    at div

Expected behavior

It shouldn't crash. Other invalid inputs don't crash. For example:

type Mapped<T> = {
    []:
}