fix: 不要依赖type默认值，不要触发kotlin特性null+null = "nullnull"

pages/template/calendar/calendar.uvue

@@ -38,6 +38,7 @@
           day: 0,
           lunar: '',
           disabled: false,
+          is_today: false
         } as DateType
       }
     },
@@ -50,7 +51,10 @@
       },
       current_day() : string {
         const time = this.timeData.data
-				return time?.IMonthCn + time?.IDayCn
+        if (time == null) {
+          return ''
+        }
+        return time.IMonthCn + time.IDayCn
       }
     },
     created() { },