autocompleteMultiselect errors on invalid option

[asportnoy]

Describe the bug

When using an autocompleteMultiselect prompt, pressing space to select when there's no results for a filter causes a crash.

To Reproduce

Run this code:

import prompts from 'prompts';

await prompts({
    type: 'autocompleteMultiselect',
    name: 'test',
    message: 'Enter some gibberish below, then press space',
    choices: [
        {
            title: 'Foo',
            value: 'Foo',
        },
    ],
});

1. Type some random text so no results match the filter
2. Press space to "select" this option
3. Error:

node:internal/readline/emitKeypressEvents:74
            throw err;
            ^

TypeError: Cannot read properties of undefined (reading 'selected')
    at AutocompleteMultiselectPrompt.handleSpaceToggle (/Users/albert/Documents/repo/node_modules/prompts/lib/elements/autocompleteMultiselect.js:101:11)
    at AutocompleteMultiselectPrompt._ (/Users/albert/Documents/repo/node_modules/prompts/lib/elements/autocompleteMultiselect.js:119:12)
    at ReadStream.keypress (/Users/albert/Documents/repo/node_modules/prompts/lib/elements/prompt.js:30:24)
    at ReadStream.emit (node:events:518:28)
    at emitKeys (node:internal/readline/utils:371:14)
    at emitKeys.next (<anonymous>)
    at ReadStream.onData (node:internal/readline/emitKeypressEvents:64:36)
    at ReadStream.emit (node:events:530:35)
    at addChunk (node:internal/streams/readable:559:12)
    at readableAddChunkPushByteMode (node:internal/streams/readable:510:3)

Node.js v20.12.2

Expected behavior

Likely should do nothing, but definitely shouldn't be erroring

System

• OS: macOS Sonoma 14.5
• Terminal: iTerm 3.5.0
• Node version: v20.12.2

Additional context

N/A