Tray app is segfaulting if initialization fails

In case the configuration is invalid or e.g. the destination directory is unreachable (which is the case for all users that don't have access to it), the tray app is currently terminating with a segmentation fault, producing a big and ugly error message on the user's screen.

Make sure to catch all problems during initialization and cleanly exit the tray app in case it won't be able to start up.

closed via commit e5c0ddd6

added Component:ATxTray label

This still seems to display an error message popup (i.e. not the described segfault any more!) in the tray area if a user doesn't have the permissions to list the UNC path at all. Needs to be checked again!

reopened

Probably the best is to not show an error message in the balloon tip, as this is highly disturbing for the user and we cannot predict all cases when it will happen. So logging the error and then silently exiting is the more user-friendly approach.

closed via commit e8d025c1