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allow pages with no subtitle

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