message: Cleared font when family prop not set
diff: UIFont *systemFont = [UIFont systemFontOfSize:UIFont.labelFontSize];
  UIFont *font = [RCTFont updateFont:(self.fontFamily == nil ? systemFont : nil) withFamily:self.fontFamily size:@(UIFont.labelFontSize) weight:nil style:nil variant:nil scaleMultiplier:1];
  NSMutableDictionary *attributes = [NSMutableDictionary new];
  + if (self.fontFamily != nil) {
  attributes[NSFontAttributeName] = font;
  + }
  [self.button setTitleTextAttributes:attributes forState:UIControlStateNormal];
  [self.button setTitleTextAttributes:attributes forState:UIControlStateHighlighted];
  [self.button setTitleTextAttributes:attributes forState:UIControlStateDisabled];
  