ml/python: fix digits samples(3.4)

samples/python/digits_video.py

@@ -1,4 +1,12 @@
 #!/usr/bin/env python
+'''
+Digit recognition from video.
+
+Run digits.py before, to train and save the SVM.
+
+Usage:
+  digits_video.py [{camera_id|video_file}]
+'''
 
 # Python 2/3 compatibility
 from __future__ import print_function
@@ -28,11 +36,7 @@ def main():
         print('"%s" not found, run digits.py first' % classifier_fn)
         return
 
-    if True:
-        model = cv.ml.SVM_load(classifier_fn)
-    else:
-        model = cv.ml.SVM_create()
-        model.load_(classifier_fn) #Known bug: https://github.com/opencv/opencv/issues/4969
+    model = cv.ml.SVM_load(classifier_fn)
 
     while True:
         _ret, frame = cap.read()