Remove unnecessary blank lines

Author: evanpw

pandas/core/generic.py

@@ -2856,7 +2856,6 @@ def clip_upper(self, threshold, axis=None):
         subset = self.le(threshold, axis=axis) | isnull(self)
         return self.where(subset, threshold, axis=axis)
 
-
     def clip_lower(self, threshold, axis=None):
         """
         Return copy of the input with values below given value(s) truncated
@@ -2881,7 +2880,6 @@ def clip_lower(self, threshold, axis=None):
         subset = self.ge(threshold, axis=axis) | isnull(self)
         return self.where(subset, threshold, axis=axis)
 
-
     def groupby(self, by=None, axis=0, level=None, as_index=True, sort=True,
                 group_keys=True, squeeze=False):
         """