Default error page is shown for Bad Request errors

When I open `/series/info` I see the following error:
```
Whitelabel Error Page

This application has no explicit mapping for /error, so you are seeing this as a fallback.
Fri Apr 17 18:41:18 MSK 2020
There was an unexpected error (type=Bad Request, status=400).
Bad Request
```
While I'd expect that it should show our own error page instead.