message: Avoid empty filtered list crash when filtering async (mac)
diff: @@ -114,6 +114,11 @@ extern void *ctx;
  {
  NSString *key = nil;
  + if (row >= [self.filteredOrderedKeys count])
  + {
  + return key;
  + }
  +
  @synchronized(self)
  {
  key = [self.filteredOrderedKeys objectAtIndex:row];
  