Useless / non-existent entries in cmake project tree

In the project view for cmake server mode, if you have multiple subprojects, there are entries in the tree for every project() declaration in cmake that don't seem to do anything. They have the same icon as the top level project entry, but appear under each subdirectory entry in the tree.

Also, there are extra targets like the ProjectName_autogen target and any custom command targets you've added that have only non existent 'files' as sources, which could probably be hidden from the tree. (The actual qrc_ and moc_ .cpp files show up under ProjectName/<Build Directory>/ProjectName_autogen, not the _autogen target)