Permit import BusinessTemplateUnknownError in ZODB

This exception is required to be used in ZODB due erp5_promise.

product/ERP5/Tool/TemplateTool.py

@@ -37,6 +37,7 @@ import tarfile
 
 from Acquisition import Implicit, Explicit
 from AccessControl import ClassSecurityInfo
+from AccessControl.SecurityInfo import ModuleSecurityInfo
 from Products.CMFActivity.ActiveResult import ActiveResult
 from Products.ERP5Type.Globals import InitializeClass, DTMLFile, PersistentMapping
 from Products.ERP5Type.DiffUtils import DiffFile
@@ -83,6 +84,8 @@ class BusinessTemplateIsMeta(Exception):
   """
   pass
 
+ModuleSecurityInfo(__name__).declarePublic('BusinessTemplateUnknownError')
+
 class TemplateTool (BaseTool):
     """
       TemplateTool manages Business Templates.