Currently there's no code that actually checks the error-code from openProject, so instead of the boolean we should directly report the error to the user via an error dialog, statusbar message or passive popup.
SVN commit 916242 by apaku: Report errors while opening a project to the user via passive popup. Patch by Brian A. Guthrie BUG:171079 M +2 -0 projectcontroller.cpp WebSVN link: http://websvn.kde.org/?view=rev&revision=916242