Fix crash when we try to save and we can't load session files

(I think that there is a bug into KGlobal::dirs()->findAllResources(...)
I will look at it why it doesn't rescue files

svn path=/trunk/KDE/kdebase/apps/konsole/; revision=547597

settings/sessioneditor.cpp

@@ -312,6 +312,8 @@ void SessionEditor::saveCurrent()
     }
 
   }
+  if (sessionList->currentText().isEmpty())
+	return;
 
   QString fullpath;
   if (sessionList->currentText() == nameLine->text()) {