Only call onChange if it exists (flagged by flow as possible bug)
Only call onChange if it exists (flagged by flow as possible bug)

Since onChange is an optional prop, guard our function by only calling it if it exists.

SumOfUs/Champaign,SumOfUs/Champaign,SumOfUs/Champaign,SumOfUs/Champaign,SumOfUs/Champaign