fixup! Do not depend on slapos.libnetworkcache, which is optional

slapos/recipe/gitclone.py

@@ -98,6 +98,9 @@ def download_network_cached(path, name, revision, networkcache_options):
   """
   Download a tar of the repository from cache, and untar it.
   """
+  if not (LIBNETWORKCACHE_ENABLED and networkcache_options.get(
+      'download-dir-url')):
+    return False
   def strategy(entry_list):
     """
     Get the latest entry.