If a resource is added to akonadi, the resource has no collections. Therefore...

If a resource is added to akonadi, the resource has no collections. Therefore the proxy will not show the resource because the mimetype does not fit the profile. After a folder sync the collections go through the proxy and are accepted by the proxy, but are not shown to the user because the resource has not been added. This code basically keeps a list of all visible resources, whenever a collection should be accepted, it checks if the resource is visible. If not, reset the model. Then the resource will contain collections and the resource and its collection is added. 

svn path=/trunk/KDE/kdepimlibs/; revision=879282