if hot reindexing test fails, make sure other tests are not affected

product/ERP5Catalog/tests/testERP5Catalog.py

@@ -121,6 +121,7 @@ class TestERP5Catalog(ERP5TypeTestCase, LogInterceptor):
   def beforeTearDown(self):
     # restore default_catalog
     self.portal.portal_catalog.default_sql_catalog_id = 'erp5_mysql_innodb'
+    self.portal.portal_catalog.hot_reindexing_state = None
     # clear Modules
     for module in [ self.getPersonModule(),
                     self.getOrganisationModule(),