Sprite Atlas warning in console when loading sprite in playmode

[2D][Sprite Atlas] Sprite Atlas warning in console when loading sprite in playmode
 
Repro steps:

1. Open SampleScene in attached project
2. Play the scene
3. Click anywhere on the GameView

Result: A triangle sprite will appear in the GameView. In the console, a warning "SpriteAtlasManager.atlasRequested wasn't listened to while TestAtlas requested." will be generated.