GES : make sure to set n_properties to 0 when needed
GES : make sure to set n_properties to 0 when needed

freesteph/gst-editing-services,pitivi/gst-editing-services,cfoch/ges,pitivi/gst-editing-services,cfoch/gst-editing-services,cfoch/ges,cfoch/gst-editing-services,MathieuDuponchelle/PitiviGes,cfoch/ges,cfoch/gst-editing-services,pitivi/gst-editing-services,volodymyrrudyi/gst-editing-services,ahmedammar/platform_external_gst_editing_services,luisbg/gst-editing-services,cfoch/gst-editing-services,ahmedammar/platform_external_gst_editing_services,freesteph/gst-editing-services,freesteph/gst-editing-services,pitivi/gst-editing-services,luisbg/gst-editing-services,volodymyrrudyi/gst-editing-services,cfoch/ges,volodymyrrudyi/gst-editing-services,MathieuDuponchelle/PitiviGes,MathieuDuponchelle/PitiviGes,MathieuDuponchelle/PitiviGes