Error handling for adbannerview effect App Store review?

Question

I have just submitted my iOS 8 app. In my storyboard, I have a AdBannerView at the bottom. I implemented the delegate and only implemented:

- (void)bannerView:(ADBannerView *)banner didFailToReceiveAdWithError:(NSError *)error
{
NSLog(@"Failed to retrieve ad");
}

I read in some forums where people tell me Apple will reject your app if you don't hide your AdBannerView when it fails.

What is the proper and conventional way to handle an ad failure? Should I replace the banner with another view?