maemo.org - Talk - Removed package leaves the package folder

I don't know why, but uninstallation of all my packages deletes all files but leaves a folders of the packages. I can't understand why... In debian packages it was easy - deleted all what was installed.
Here is a example of my .spec file. It's a simple package with only 3 files: .desktop, .png and aliendalvik-restart that located in /usr/share/jolla-adrestart folder. Only this folder leaves after uninstallation.
(I know, I know the "jolla-" prefix is for jolla apps, it's just example of my first package)

Code:

Name:          adalvikrefresh

Version:       0.3

Release:       3

Summary:       Alien Dalvik Refresh

Group:         System/Tools

Vendor:        Schturman

Distribution:  SailfisfOS

Packager: Schturman <schturman@hotmail.com>

URL:           www.dhrider.co.cc



License:       GPL



%description

Refresh buttom of Alien Dalvik service.



%files

/usr/share/applications/adalvikrefresh.desktop

/usr/share/icons/hicolor/86x86/apps/aliendalvikrestart.png



%defattr(4755,root,root)

/usr/share/jolla-adrestart/aliendalvik-restart



%changelog

* Wed Jan 25 2014 Builder <builder@...> 0.1

- First build.

Can our experts tell me what wrong here please ?

We tried with Coderus to find the reason, but without success :(

I found one interesting explanation about postuninstall script (%postun): http://wiki.mandriva.com/en/Development/Howto/RPM

Code:

This will allow the programmer to distinguish different attitudes of his scripts depending on the operation: install or upgrade. 

  For install scripts ( %post, %pre ) check if $1 is equal to "1" then it is a first time install, not an update.


 For uninstall scripts ( %postun, %preun  ) check if $1 is equal to "0", if yes then it is a full removal; if not  it is either an upgrade or an install --force of the same package.

Code:

To test this argument, the following 'if' statement is used: 

 %postun

if [ $1 = 0 ]; then

     // Do stuff specific to uninstalls

fi

if [ $1 = 1 ]; then

     // Do stuff specific to upgrades

fi

In this way I can add rm -rf /usr/share/jolla-adrestart to this %postun section and it will work perfectly. But I still don't know if this correct way to do for removing packages...
Please any advice ?