[fix] prevent errors when last sync is unavailable
[fix] prevent errors when last sync is unavailable

cozy/cozy-home,CPatchane/cozy-collect,lespacedunmatin/cozy-collect,gregorylegarec/cozy-collect,lespacedunmatin/cozy-collect,cozy/cozy-home,cozy/cozy-home,gregorylegarec/cozy-collect,CPatchane/cozy-collect,gregorylegarec/cozy-collect