Update app.py

app.py

@@ -23,7 +23,7 @@ face_cascade = cv2.CascadeClassifier('haarcascade.xml')
 # a.text_area(value='detecting', label='')
 while True:
     ret, frame = cam.read()
-    if frame.any():
+    if frame:
         gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
         faces = face_cascade.detectMultiScale(gray, 1.1, 4)
         frame = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)