Fix for --override-chars-to-quote bug

git-svn-id: http://svn.savannah.nongnu.org/svn/rdiff-backup@673 2b77aa54-bcbc-44c9-a7ec-4f6cf2b41109

branches/r1-0/rdiff-backup/rdiff_backup/fs_abilities.py

@@ -177,7 +177,8 @@ class FSAbilities:
 					log.Log("Warning: File system no longer needs quoting, "
 							"but will retain for backwards compatibility.", 2)
 					self.chars_to_quote = old_chars
-				else: log.Log.FatalError("""New quoting requirements
+				elif Globals.chars_to_quote is None:
+					log.Log.FatalError("""New quoting requirements
 
 This may be caused when you copy an rdiff-backup directory from a
 normal file system on to a windows one that cannot support the same