Don't give rate limit delay when project is not found

api/rate.go

@@ -11,7 +11,7 @@ func (api *WebAPI) ReserveSubmit(pid int64) *rate.Reservation {
 	if !ok {
 		project := api.Database.GetProject(pid)
 		if project == nil {
-			return &rate.Reservation{}
+			return nil
 		}
 
 		limiter = rate.NewLimiter(project.SubmitRate, 1)
@@ -27,7 +27,7 @@ func (api *WebAPI) ReserveAssign(pid int64) *rate.Reservation {
 	if !ok {
 		project := api.Database.GetProject(pid)
 		if project == nil {
-			return &rate.Reservation{}
+			return nil
 		}
 
 		limiter = rate.NewLimiter(project.AssignRate, 1)

api/task.go

@@ -56,6 +56,13 @@ func (api *WebAPI) SubmitTask(r *Request) {
 	}
 
 	reservation := api.ReserveSubmit(createReq.Project)
+	if reservation == nil {
+		r.Json(JsonResponse{
+			Ok:      false,
+			Message: "Project not found",
+		}, 404)
+		return
+	}
 	delay := reservation.DelayFrom(time.Now()).Seconds()
 	if delay > 0 {
 		r.Json(JsonResponse{
@@ -108,6 +115,13 @@ func (api *WebAPI) GetTaskFromProject(r *Request) {
 	}
 
 	reservation := api.ReserveAssign(project)
+	if reservation == nil {
+		r.Json(JsonResponse{
+			Ok:      false,
+			Message: "Project not found",
+		}, 404)
+		return
+	}
 	delay := reservation.DelayFrom(time.Now()).Seconds()
 	if delay > 0 {
 		r.Json(JsonResponse{