Make ETM fetch empty collections at least once

Review Request #101844 - Created July 3, 2011 and submitted

Information
Kevin Krammer
kdepimlibs
master
271913
Reviewers
kdepimlibs
skelly
When collections are empty because they have just been created (synchronizeCollectionTree or equivalent operation), an application using EntityTreeModel will not fetch their contents, assuming they are truly empty (contain no items).
This seems to be done for optimization purposes.

This patch make ETM only skip collections which are known to be empty.
None, yet. Actually not even build (a recent compiler upgrade seems to have broken my qt-copy and now kdepimlibs won't build anymore).
Just as a general idea for discussion
Commit Hook
This review has been submitted with commit 09d52e45006d36f82e5dda7bc7dc2f7e0e7a4f3c by Kevin Krammer to branch master.
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