"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 ```