Folder could not be created

[Thomas Weißschuh]

Since upgrading to 6.4.0 (also applies to git:51164c4) offlineimap always
terminates with messages like following:
(note the trailing "." on folder1)

 Creating new IMAP folder '<folder1>.' on server <Account1>
 ERROR: Creating folder <folder2>/<subfolder21> on repository Local
 Folder '<folder1>.'<account> could not be created. Server responded:
   ('NO', ['CREATE Failed. The folder name provided already exists.'])
 ERROR: Folder '<folder1>.'[<account>] could not be created. Server responded: 
   ('NO', ['CREATE Failed. The folder name provided already exists.'])

I am using "/" as local maildir separator.

It seems that the code after:
   (./offlineimap/repository/Base.py  line 172 in git:51164c4)
   # Find new folders on dst_repo.
   for dst_name, dst_folder in dst_hash.iteritems():

should do the separator replacement before the "if"-clause and check
against this.

Greetings,
Thomas