Update grid.py

Signed-off-by: Muhammad Rizwan Munawar <muhammadrizwanmunawar123@gmail.com>

Author: RizwanMunawar

streamgrid/grid.py

@@ -180,7 +180,10 @@ def run(self):
 
         try:
             while self.running:
-                self.update_display()
+                has_frame = self.update_display()
+                if not has_frame:
+                    LOGGER.info("ℹ️ All videos ended. Exiting.")
+                    break
                 key = cv2.waitKey(1) & 0xFF
                 if key == 27:  # ESC
                     break