Revert "provide a better panic message when no jobs in scheduler and …

…start blocking called (#501)" (#503)

This reverts commit b035fe3.

example_test.go

@@ -776,7 +776,6 @@ func ExampleScheduler_Stop() {
 	fmt.Println(s.IsRunning())
 
 	s = gocron.NewScheduler(time.UTC)
-	_, _ = s.Every(1).Second().Do(task)
 
 	go func() {
 		time.Sleep(1 * time.Second)

scheduler.go

@@ -77,12 +77,7 @@ func (s *Scheduler) SetMaxConcurrentJobs(n int, mode limitMode) {
 
 // StartBlocking starts all jobs and blocks the current thread.
 // This blocking method can be stopped with Stop() from a separate goroutine.
-//
-// There must be at least 1 job in the scheduler or a panic will occur.
 func (s *Scheduler) StartBlocking() {
-	if len(s.Jobs()) == 0 {
-		panic("gocron: scheduler must have at least 1 job before calling StartBlocking")
-	}
 	s.StartAsync()
 	s.startBlockingStopChanMutex.Lock()
 	s.startBlockingStopChan = make(chan struct{}, 1)

scheduler_test.go

@@ -996,8 +996,6 @@ func TestScheduler_Stop(t *testing.T) {
 	})
 	t.Run("stops a running scheduler calling .Stop()", func(t *testing.T) {
 		s := NewScheduler(time.UTC)
-		_, err := s.Every(1).Second().Do(func() {})
-		require.NoError(t, err)
 
 		go func() {
 			time.Sleep(time.Second)
@@ -2707,11 +2705,3 @@ func TestScheduler_WithDistributedLocker_With_Name(t *testing.T) {
 		})
 	}
 }
-
-func TestScheduler_StartBlocking(t *testing.T) {
-	t.Run("panics if no jobs are added", func(t *testing.T) {
-		s := NewScheduler(time.UTC)
-		expected := "gocron: scheduler must have at least 1 job before calling StartBlocking"
-		assert.PanicsWithValue(t, expected, s.StartBlocking)
-	})
-}