cache: fix code style

overviewer_core/cache.py

@@ -21,6 +21,7 @@ attribute.
 
 """
 
+
 class LRUCache(object):
     """A simple, generic, in-memory LRU cache that implements the standard
     python container interface.
@@ -40,6 +41,7 @@ class LRUCache(object):
     """
     class _LinkNode(object):
         __slots__ = ['left', 'right', 'key', 'value']
+
         def __init__(self, l=None, r=None, k=None, v=None):
             self.left = l
             self.right = r
@@ -73,6 +75,7 @@ class LRUCache(object):
     # Initialize an empty cache of the same size for worker processes
     def __getstate__(self):
         return self.size
+
     def __setstate__(self, size):
         self.__init__(size)