Thank you for your query to DoctorSpring.com
No, at no point in time does one chamber remain entirely empty of blood. Even when blood is pumped from one chamber into the next and thereafter into the vessels, some amount always remains behind.
During the first part of the ejection, the ventricular pressure rises and blood is intensively ejected to the arteries – rapid ejection. As the blood volume in the ventricles decreases, the pressure gradient between ventricles and arteries decreases and blood is ejected more slowly – decreased or slow ejection. Under resting condition, about 70 ml of blood is ejected from each ventricle during ejection; this volume is called the stroke or systolic volume. About 60 ml of blood remains in each ventricle at the end of systole which is known as the end-systolic volume.
So in short, the blood flow is continuous (not that one chamber empties entirely into the next and so forth)
Hope this helps, feel free to discuss further