Return True if a ERP5 Site is present as subobject. This is

      usefull to identify if a erp5 is present already on a Zope
      Setup.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@44218 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/patches/OFSFolder.py

@@ -46,3 +46,12 @@ def Folder_setOb(self, id, object):
   _updateCacheEntry(self.id, id)
 
 Folder._setOb = Folder_setOb
+
+def Folder_isERP5SitePresent(self):
+  """ Return True if a ERP5 Site is present as subobject. This is
+      usefull to identify if a erp5 is present already on a Zope
+      Setup.
+  """
+  return len(self.objectIds("ERP5 Site")) > 1
+
+Folder.isERP5SitePresent = Folder_isERP5SitePresent