Ticket #2 (bug)

When trying to reinstall qPGS I've got following error:

BadRequest googlesitemap_properties does not exist

Traceback (innermost last):
  Module ZPublisher.Publish, line 101, in publish
  Module ZPublisher.mapply, line 88, in mapply
  Module ZPublisher.Publish, line 39, in call_object
  Module Products.CMFQuickInstallerTool.QuickInstallerTool, line 458, in reinstallProducts
  Module Products.CMFQuickInstallerTool.QuickInstallerTool, line 441, in uninstallProducts
  Module Products.CMFQuickInstallerTool.InstalledProduct, line 254, in uninstall
  Module Products.ExternalMethod.ExternalMethod, line 225, in __call__
   - __traceback_info__: ((<PloneSite instance at b3fa2710>,), {}, None)
  Module /home/iber/data1/Products/qPloneGoogleSitemaps/Extensions/Install.py, line 75, in uninstall
  Module OFS.ObjectManager, line 460, in manage_delObjects
BadRequest: googlesitemap_properties does not exist

It look like uninstallation script shouldn't break if it is trying to uninstall old version of product.