The parameter shacache can be None as well.

Because the user can just use the 'select' method to retrieve the information
from shadir server.

slapos/libnetworkcache/__init__.py

@@ -29,9 +29,10 @@ class NetworkcacheClient(object):
      - SHACACHE
   '''
 
-  def __init__(self, shacache, shadir=None):
+  def __init__(self, shacache=None, shadir=None):
     ''' Set the initial values. '''
     # ShaCache Properties
+    if shacache is not None:
       shacache_urlparse = urlparse(shacache)
       self.shacache_host = shacache_urlparse.hostname
       if shacache_urlparse.port is not None: