ERP5TypeTestCase : call setSite to reinitialise the portal

This fix issues due to the publish method wiich is calling
request.close wich then call setSite without a site to reset it

product/ERP5Type/tests/ERP5TypeTestCase.py

@@ -839,6 +839,10 @@ class ERP5TypeTestCaseMixin(ProcessingNodeTestCase, PortalTestCase):
             PAS._extractUserIds = orig_extractUserIds
           # Restore security manager
           setSecurityManager(sm)
+          # Restore site removed by closing of request
+          setSite(self.portal)
+
+
 
         # Make sure that the skin cache does not have objects that were
         # loaded with the connection used by the requested url.