Sebastian Wilhelmi c74177337d gdbusmessage: Disallow zero-length elements in arrays
They are not allowed in the specification, and can lead to infinite
loops when parsing.

That’s a security issue if your application is accepting D-Bus messages
from untrusted peers (perhaps in a peer-to-peer connection). It’s not
exploitable when your application is connected to a bus (such as the
system or session buses), as the bus daemons (dbus-daemon or
dbus-broker) filter out such broken messages and don’t forward them.

Arrays of zero-length elements are disallowed in the D-Bus
specification: https://dbus.freedesktop.org/doc/dbus-specification.html#container-types

oss-fuzz#41428, #41435
Fixes: #2557
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