in #2772 users noted that we are throwing a javascript exception as we are trying to apply .length to a null and hence that fails.

we have 2 options. First, we can just elide these results from the response we give the user, but this wouldn't correspond to the ft.search documentation. Therefore, instead, as redis doesn't return a document, but a null, we should do the same, and return an empty null object for these documents. It's up to the user to handle them

fixes #2772

Description

Describe your pull request here

Checklist

• Does npm test pass with this change (including linting)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?