Update gui/wxpython/gui_core/widgets.py

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: petrasovaa

gui/wxpython/gui_core/widgets.py

@@ -915,6 +915,7 @@ def Clone(self):
         return MapNameValidator()
 
 class GenericMultiValidator(Validator):
+
     """This validator checks conditions and calls callbacks
     in case the condition is not fulfilled.
     """