make sure the list of uid is not empty when we delete message, this should fix...

make sure the list of uid is not empty when we delete message, this should fix a random problem in testERP5Catalog

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@13429 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/CMFActivity/Activity/SQLDict.py

@@ -454,7 +454,8 @@ class SQLDict(RAMDict):
       if len(result):
         uid_list = activity_tool.SQLDict_readUidList(path = path, method_id = method_id,
                                                      processing_node = None,)
-        activity_tool.SQLDict_delMessage(uid = [x.uid for x in uid_list])
+        if len(uid_list)>0:
+          activity_tool.SQLDict_delMessage(uid = [x.uid for x in uid_list])
 
   def getMessageList(self, activity_tool, processing_node=None,include_processing=0,**kw):
     # YO: reading all lines might cause a deadlock