Fix pycodestyle violation

Author: dgelessus

kaitaistruct.py

@@ -444,6 +444,7 @@ def __init__(self, max, actual, io, src_path):
         self.max = max
         self.actual = actual
 
+
 class ValidationNotAnyOfError(ValidationFailedError):
     """Signals validation failure: we required "actual" value to be
     from the list, but it turned out that it's not.