Add try/except for ImportError with pysvn

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@7510 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Subversion/Tool/SubversionTool.py

@@ -35,7 +35,7 @@ from Products.ERP5Type.Document.Folder import Folder
 from Products.ERP5Type import Permissions
 from Products.ERP5Subversion import _dtmldir
 from Products.ERP5Subversion.SubversionClient import newSubversionClient
-import os, re, pysvn
+import os, re
 from DateTime import DateTime
 from cPickle import dumps, loads
 from App.config import getConfiguration
@@ -48,6 +48,11 @@ from OFS.Traversable import NotFound
 from Products.ERP5Type.patches.copyTree import copytree, Error
 from Products.ERP5Type.patches.cacheWalk import cacheWalk
 
+try:
+  import pysvn
+except ImportError:
+  pysvn = None
+
 try:
   from base64 import b64encode, b64decode
 except ImportError: