Make last Query tab closable

HeidiSQL is associated with .sql files in my installation. When I backup a database, I can inmediatly open the backup script and select the database onto wich I want to run it. This works great.

When the query is executed, the query tab can't be closed because it is the only query tab left. I'd like to see that all query tabs can be closed (I often use CTRL+W), and that a blank query tab appears when the last query tab is closed.

The reason for this is that when you press CTRL+S accidentally while in the Query tab, my backup gets overwritten with the blank screen