Update categorical.py

Author: another-green

pandas/core/arrays/categorical.py

@@ -1411,7 +1411,6 @@ def isna(self):
 
         ret = self._codes == -1
         return ret
-
     isnull = isna
 
     def notna(self):
@@ -1433,7 +1432,6 @@ def notna(self):
 
         """
         return ~self.isna()
-
     notnull = notna
 
     def put(self, *args, **kwargs):
@@ -2556,7 +2554,6 @@ def index(self):
              stacklevel=2)
         return self._index
 
-
 # utility routines