The new 'utf8foldernames' will not work together with the existing
'decodefoldernames' option (which will be documented in the next
commit). Therefore this commit will check for this condition and
abort the synchronization of a misconfigured account before doing
any changes.
Other accounts are not affected.
Signed-off-by: Urs Liska <git@ursliska.de>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>