No it's not a failure- in the testing manual only the windscreen gets a specific mention (driver's view of the road) no other window is subject to testing.
This is the reason why you can have a car with very dark tints pass an MOT, yet still be nicked for having them- a traffic cop may be of the opinion that you can't see properly through them, but as they arn't tested they can't fail.
Just remove any shards of glass before test, and have a read-
http://www.motuk.co.uk/manual_830.htm