Do not only catch Exceptions but any Throwable during rmt share delete

When a remote share is deleted, we notify the remove instance. This may
trigger various error conditions, which we want to catch in order to
avoid undeletable shares. The try-catch, however, did only capture
exceptions, so things like TypeErrors were not caught and caused the
process to fail hard.

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>