Do garbage collection to remove references from non-persistent objects

This commit is similar to r32811 and should fix regressions caused by r38601
for good.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@38635 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/BusinessTemplate.py

@@ -3374,6 +3374,7 @@ class DocumentTemplateItem(BaseTemplateItem):
             # Then we need to flush from all caches, not only the one from this
             # connection
             self.getPortalObject()._p_jar.db().cacheMinimize()
+            gc.collect()
     else:
       BaseTemplateItem.install(self, context, trashbin, **kw)
       for id in self._archive.keys():