Launcher will run OpenMW with no ESM or ESP selected
Currently the Launcher will launch OpenMW even if no ESM or ESP is checked and OpenMW will default to Morrowind.ESM.
Instead, the Launcher should not even start OpenMW if no content files have been selected; in this case, the Launcher should tell the user that there are no files selected instead of running OpenMW.
(RM-812 from redmine: created on 2013-06-10 by Paul McElroy, , closed on 2013-06-17 by dark f)