Fix number of arguments in overridden method.
Fix number of arguments in overridden method.

inteligencia-coletiva-lsd/pybossa,OpenNewsLabs/pybossa,Scifabric/pybossa,Scifabric/pybossa,stefanhahmann/pybossa,PyBossa/pybossa,PyBossa/pybossa,jean/pybossa,geotagx/pybossa,jean/pybossa,geotagx/pybossa,stefanhahmann/pybossa,OpenNewsLabs/pybossa,inteligencia-coletiva-lsd/pybossa