"Additional Data" in issue detail page omits empty strings from "extra" object

### Environment

* Sentry cloud
* self-hosted (https://develop.sentry.dev/self-hosted/)

### Version

* Sentry cloud as of 2023-10-19
* Self-hosted: 22.8.0

### Link

_No response_

### DSN

_No response_

### Steps to Reproduce

1. send an [error payload](https://develop.sentry.dev/sdk/event-payloads/#optional-attributes) containing `extra` with an empty string value, e.g. `{"extra": {"sha":"", "foo": "bar"}}`
2. visit issue page for created event

### Expected Result

any fields in `extra` that have empty strings as their value are displayed in the UI under "Additional Data", e.g.:

```
Additional Data

foo: bar
sha:
```

### Actual Result

Only non-empty strings are present in Additional Data - in our example `sha` is absent. The empty string fields are present in the JSON event navigable from the same page (i.e. it was not dropped on ingestion)

```
Additional Data

foo: bar
```