Handle::get_dimensions_no_error(): Implement the error-less version here
Handle::get_dimensions_no_error(): Implement the error-less version here

The public rsvg_handle_get_dimensions() doesn't return an error code,
but just an all-zeros RsvgDimensionData.  Put that logic in Handle,
since we'll need it for the GObject::get_property implementation.

GNOME/librsvg,GNOME/librsvg,GNOME/librsvg,GNOME/librsvg