I imported a bunch of old markdown posts to the blog-starter example but some of the post metadata was not returned by the API in the example code.
For example, having `published: false` in post metadata was not returned in the item fields.
The problem was in check:
```
if (data[field]) {
items[field] = data[field]
}
```
This rejects all falsy values in addition to fields that are not set. Checking only for `undefined` should fix this issue.
I didn't find existing integration tests for the blog example nor an issue describing this problem.
## Bug
- [ ] Related issues linked using `fixes #number`
- [ ] Integration tests added
- [ ] Errors have helpful link attached, see `contributing.md`
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