## Description
This changes allows empty strings (`''`) to be used as defaultValue for fields of types:
`'text'`; `'textarea'`; `'email'`; `'code'`. This can be useful when you
want to ensure the value is always a `string` instead of
`null`/`undefined`.
- [x] I have read and understand the
[CONTRIBUTING.md](https://github.com/payloadcms/payload/blob/main/CONTRIBUTING.md)
document in this repository.
## Type of change
- [x] New feature (non-breaking change which adds functionality)
## Checklist:
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] Existing test suite passes locally with my changes