collective/collective.prettyphoto — pull request #1 by a-pasquale (2012-07-31 02:42:48+00:00)
Title: Add property sheet if it doesn't already exist in portal_properties.  

This fixes a bug described at http://plone.293351.n2.nabble.com/Problem-to-install-PrettyPhoto-td7350043.html where the installer fails with an AttributeError: prettyphoto_properties.