fixed a bug

app.py

@@ -11,15 +11,16 @@ def detect_and_blur_faces(image):
 
     output_image = image.copy()
 
+    if 'face_1' in resp:
 
-    for i in range(len(resp)):
+        for i in range(len(resp)):
 
-        [x, y, w, h] = resp[f'face_{i+1}']['facial_area']
+            [x, y, w, h] = resp[f'face_{i+1}']['facial_area']
 
-        # Blur the detected face.
-        face = output_image[y:h, x:w]
-        blurred_face = cv2.GaussianBlur(face, (99, 99), 30)
-        output_image[y:h, x:w] = blurred_face
+            # Blur the detected face.
+            face = output_image[y:h, x:w]
+            blurred_face = cv2.GaussianBlur(face, (99, 99), 30)
+            output_image[y:h, x:w] = blurred_face
 
     return output_image