Posted by Sabrina B. @gametimegirl Atlanta Hawks forward Ivan Johnson enjoyed a solid rookie season this year, but hat production fell off quite a bit in the postseason, as the 28-year old rookie missed 11 of 16 shots in five games before registering a “Did Not Play — Coach’s Decision” in Atlanta’s series-deciding Game 6 loss on Thursday. He didn’t respond well to your typically rambunctious Celtics fan…