deleting a platform doesn't delete its config file??

apache on aegir-up could not be restarted. Changes might not be      [warning]
available until this has been done. (error: apache2: Syntax error on
line 227 of /etc/apache2/apache2.conf: Syntax error on line 25 of
/etc/apache2/conf.d/aegir.conf: Syntax error on line 21 of
/var/aegir/config/server_master/apache/platform.d/platform_hostmaster.conf:
Could not open configuration file
/var/aegir/hostmaster-6.x-1.9/.htaccess: No such file or directory
Action 'graceful' failed.
The Apache error log may have more information.)
<em>apache</em> on <em>aegir-up</em> could not be restarted. Changes [warning]
might not be available until this has been done. (error: <em>apache2:
Syntax error on line 227 of /etc/apache2/apache2.conf: Syntax error
on line 25 of /etc/apache2/conf.d/aegir.conf: Syntax error on line 21
of
/var/aegir/config/server_master/apache/platform.d/platform_hostmaster.conf:
Could not open configuration file
/var/aegir/hostmaster-6.x-1.9/.htaccess: No such file or directory
Action &#039;graceful&#039; failed.
The Apache error log may have more information.</em>)

We've been testing updating the front-end as per: http://community.aegirproject.org/upgrading/debian#Keeping_custom_distri...

So, we'd updated the front-end to a new platform with a custom makefile, which worked just fine. After deleting the old platform (from the front-end) and running 'dpkg-reconfigure aegir-hostmaster', we got these errors, though the creating of the new platform, and the migration of the hostmaster site into it appear to have worked fine.