dbus: don't crash on dbus local messages
dbus: don't crash on dbus local messages

dbus local messages doesn't have a sender.

Signed-off-by: Yuxuan Shui <7f7e1535bcd10fa942d56a3436533af20f33203f@gmail.com>

yshui/deai,yshui/deai,yshui/deai