fix error that occurs when kresus try to format a not loaded or empty date
fix error that occurs when kresus try to format a not loaded or empty date

ZeHiro/kresus,bnjbvr/kresus,bnjbvr/kresus,bnjbvr/kresus,ZeHiro/kresus,bnjbvr/kresus,jankeromnes/kresus,ZeHiro/kresus,jankeromnes/kresus,ZeHiro/kresus,jankeromnes/kresus,jankeromnes/kresus