The user must only be able to close the connection if it is defined

slapos/libnetworkcache/__init__.py

@@ -131,7 +131,10 @@ class NetworkcacheClient(object):
 
   def close(self):
     ''' It must be called to close the HTTP Connection. '''
+    if hasattr(self, 'shacache_connection'):
       self.shacache_connection.close()
+
+    if hasattr(self, 'shadir_connection'):
       self.shadir_connection.close()
 
 class FileNotFound(Exception):