Core: Fix useStoryPrepared hook failing with undefined data

[SpookyJelly]

Closes #

What I did

api.getData returns undefined sometimes. which is used by isPrepared, the inner logic of useStoryPrepared hook.
however, isPrepared hook access to 'type' att without any check.
so I added an exception for this. Now hooks works as expected.

How to test

1. Clone this branch.
2. Type this where can use manager-apiimport { useStoryPrepared } from '@storybook/manager-api
3. Check hooks works without error

it

Checklist

• Make sure your changes are tested (stories and/or unit, integration, or end-to-end tests)
• Make sure to add/update documentation regarding your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Maintainers

• If this PR should be tested against many or all sandboxes,
  make sure to add the ci:merged or ci:daily GH label to it.
• Make sure this PR contains one of the labels below.

["cleanup", "BREAKING CHANGE", "feature request", "bug", "documentation", "maintenance", "dependencies", "other"]

🦋 Canary release

This pull request has been released at the npm dist tag pr-22631. Install it by pinning all your Storybook dependencies to that tag.

More information

Published version	7.1.1-pr-22631-1689802540-351503cb.0
npm dist tag	@storybook/cli@pr-22631
Triggered by	@JReinhold
Repository	SpookyJelly/storybook
Branch	patch-1
Commit	351503cb
Datetime	Wed Jul 19 21:35:40 UTC 2023 (1689802540)
Workflow run	5604333170

To request a new release of this PR ping the @storybookjs/core team.

core team members can create a new canary release here or locally with gh workflow run --repo storybookjs/storybook canary-release-pr.yml --field pr=22631

[SpookyJelly]

I will check these skipped workflows

[storybook-bot]

Failed to publish canary version of this pull request, triggered by @JReinhold. See the failed workflow run at: https://github.com/storybookjs/storybook/actions/runs/5604266451