Merge pull request #21028 from AleksandrPanov:fix_markers_parse_in_gen_pattern.py

doc/pattern_tools/gen_pattern.py

@@ -171,7 +171,7 @@ def main():
     parser.add_argument("-m", "--markers", help="list of cells with markers for the radon checkerboard. Marker "
                                                 "coordinates as list of numbers: -m 1 2 3 4 means markers in cells "
                                                 "[1, 2] and [3, 4]",
-                        action="store", dest="markers", nargs="+", type=int)
+                        default=argparse.SUPPRESS, action="store", dest="markers", nargs="+", type=int)
     args = parser.parse_args()
 
     show_help = args.show_help
@@ -195,6 +195,8 @@ def main():
                       "A5": [148, 210]}
         page_width = page_sizes[page_size][0]
         page_height = page_sizes[page_size][1]
+    markers = None
+    if p_type == "radon_checkerboard" and "markers" in args:
         if len(args.markers) % 2 == 1:
             raise ValueError("The length of the markers array={} must be even".format(len(args.markers)))
         markers = set()