I'm having an issue with popups in the new 4.0 API. Specifically, popups are showing up on a graphic layer that consists of multiple polylines created dynamically from the results of a query on a point feature layer. I don't define a popupTemplate on either the graphic or the graphic layer itself, yet a popup is still showing up on click. What am I doing wrong? Is there a way to force disable popups on a graphic layer in 4.0?