Getting error FetchDatabaseListFailed on creating data source

Tried to create a data source using a mysql URI such as `mysql://replicant:mypassword@averyreal.example.fqdn:4417/myDB`.

I get a pop up saying: 
```
[E1002] FetchDatabaseListFailed
Failed to get database list.

Error: NameError
name '_mysql' is not defined
```