Merge pull request #13415 from alalek:issue_13406

* python: add checks for drawKeypoints() symbol

* python: more hacks in hdr_parser.py

modules/python/test/test_features2d.py

@@ -0,0 +1,18 @@
+#!/usr/bin/env python
+from __future__ import print_function
+
+import numpy as np
+import cv2 as cv
+
+from tests_common import NewOpenCVTests
+
+class Features2D_Tests(NewOpenCVTests):
+
+    def test_issue_13406(self):
+        self.assertEqual(True, hasattr(cv, 'drawKeypoints'))
+        self.assertEqual(True, hasattr(cv, 'DrawMatchesFlags_NOT_DRAW_SINGLE_POINTS'))
+        self.assertEqual(True, hasattr(cv, 'DRAW_MATCHES_FLAGS_NOT_DRAW_SINGLE_POINTS'))
+
+
+if __name__ == '__main__':
+    NewOpenCVTests.bootstrap()