Fix fetchCollectionStatistics usage by clients that do not monitor items. Item...

Fix fetchCollectionStatistics usage by clients that do not monitor items. Item notifications may modify the collectionstatistics, but only going through with the check if there is a receiver attached to the item* signals is wrong, as some clients may not care about the individual items but just the Collections and CollectionStatistics themselves.

svn path=/trunk/KDE/kdepimlibs/; revision=1133481