Update app/app_utils.py

app/app_utils.py

@@ -57,8 +57,10 @@ def preprocess_image_and_predict(inp):
                 cur_face_hm = np.float32(cur_face_hm) / 255
                 heatmap = show_cam_on_image(cur_face_hm, grayscale_cam, use_rgb=True)
 
-    return cur_face, heatmap, confidences
-
+            return cur_face, heatmap, confidences
+        
+        else:
+            return None, None
 
 def preprocess_video_and_predict(video):