The source project of this merge request has been removed.
zx: Handle empty direction element for args and signals
From the DBus specification [1]:
The direction element on may be omitted, in which case it defaults to "in" for method calls and "out" for signals. Signals only allow "out" so while direction may be specified, it's pointless.
[1] https://dbus.freedesktop.org/doc/dbus-specification.html#introspection-format: