Signal an error when an unknown method is called

[ryuslash]

Currently this project just seems to drop the signal when a request for an unknown method appears, which makes clients wait for a reply that never comes and time out. Other dbus services seem to raise an error instead, letting the clients move on to whatever comes next.

For example, an invocation using dbus-send with mowedline and another service:

drd% time dbus-send --print-reply --session --dest=net.retroj.mowedline /net/retroj/mowedline net.retroj.mowedline.updatee string:foo string:bar 
Error org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
dbus-send --print-reply --session --dest=net.retroj.mowedline   string:foo   0.00s user 0.00s system 0% cpu 25.028 total



drd% time dbus-send --print-reply --session --dest=org.PulseAudio1 /org org.freedesktop.DBus.Introspectable.Introspectt 
Error org.freedesktop.DBus.Error.UnknownMethod: Method "Introspectt" with signature "" on interface "org.freedesktop.DBus.Introspectable" doesn't exist

dbus-send --print-reply --session --dest=org.PulseAudio1 /org   0.00s user 0.00s system 0% cpu 0.003 total

Note the total time on both invocations.

[retroj]

moved to ec1oud/dbus-egg#3