Error when artist detail is viewed

[tingtom]

Describe the bug
When viewing the detail page for an author, if there's no overview text you'll get a React error and the page will fail to render. Seems to be because the overview text is undefined/empty.

To Reproduce
Steps to reproduce the behavior:

1. Add author "James S A Corey"
2. Click on his name to view author details

Expected behavior
The page should render successfully and no error is thrown

Screenshots

Logs
Link to debug logs.

System info (please complete the following information):

• Readarr Version: 0.1.0.19
• Operating System: Linux/Docker
• .net Framework (Windows) or mono (macOS/Linux) Version: [e.g. 4.5 or 5.12]

Additional context
Line https://github.com/Readarr/Readarr/blob/readarr/frontend/src/Artist/Details/ArtistDetails.js#L520