messages going to wrong window

Not sure if this is the same as #303 ....

Assume that you do **not** have a table named "foo".  This query

```sql
update foo
set bar = 1
```

Causes an error ("relation "foo" does not exist LINE 1: update foo ^") to appear.  That's great, but it's appearing in the "Data" tab, not the messages tab (where I would expect it).

