Fix minor issue with Cache
Fix minor issue with Cache

jean/pybossa,proyectos-analizo-info/pybossa-analizo-info,Scifabric/pybossa,geotagx/pybossa,proyectos-analizo-info/pybossa-analizo-info,stefanhahmann/pybossa,proyectos-analizo-info/pybossa-analizo-info,CulturePlex/pybossa,inteligencia-coletiva-lsd/pybossa,PyBossa/pybossa,harihpr/tweetclickers,jean/pybossa,PyBossa/pybossa,CulturePlex/pybossa,stefanhahmann/pybossa,Scifabric/pybossa,inteligencia-coletiva-lsd/pybossa,geotagx/pybossa,CulturePlex/pybossa,harihpr/tweetclickers,OpenNewsLabs/pybossa,OpenNewsLabs/pybossa