Add default values for atspi_hyperlink_get_index_range variables
Add default values for atspi_hyperlink_get_index_range variables

  If there are no default values, after unsuccessful dbus call,
    some random values of start_offset and end_offset are set.

https://bugzilla.gnome.org/show_bug.cgi?id=755727

GNOME/at-spi2-core,GNOME/at-spi2-core,GNOME/at-spi2-core