add an exception class to use for error raised by connection plugins

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@39892 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/Tool/WebServiceTool.py

@@ -35,6 +35,10 @@ from Products.ERP5Type.Tool.BaseTool import BaseTool
 from Products.ERP5Type import Permissions
 from Products.ERP5Type import _dtmldir
 
+class ConnectionError(Exception):
+  pass
+
+
 connection_plugin_registry = {}
 
 def registerConnectionPlugin(name, klass, ignore_duplicate=False):