Small tweaks

* fix repo's nil ptr err,
* make dismissedAt a pointer.

system/repository/reminder.go

@@ -88,6 +88,8 @@ func (r reminder) Find(filter types.ReminderFilter) (set types.ReminderSet, err
 }
 
 func (r reminder) FindByID(ID uint64) (rm *types.Reminder, err error) {
+	rm = &types.Reminder{}
+
 	q := r.query().
 		Where("r.id = ?", ID)
 

system/types/reminder.go

@@ -17,8 +17,8 @@ type (
 		AssignedBy uint64    `json:"assignedBy,string" db:"assigned_by"`
 		AssignedAt time.Time `json:"assignedAt" db:"assigned_at"`
 
-		DismissedBy uint64    `json:"dismissedBy,string" db:"dismissed_by"`
-		DismissedAt time.Time `json:"dismissedAt" db:"dismissed_at"`
+		DismissedBy uint64     `json:"dismissedBy,string" db:"dismissed_by"`
+		DismissedAt *time.Time `json:"dismissedAt" db:"dismissed_at"`
 
 		RemindAt time.Time `json:"remindAt" db:"remind_at"`