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dbus-glib returns UnknownMethod on GetAll if no properties

Submitted by Olivier Crête @ocrete

Assigned to Simon McVittie

Link to original bug (#22156)

Description

In 0.80, there was a change in the handling of properties in dbus-glib. It claims to support the Properties interface, but when one tries to call GetAll() it returns "UnknownMethod" if there are no properties defined for this object. Older versions of dbus-glib properly returned an empty array.

It should either not declare that interface or implement it properly.

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