Remove redundant check from String.concat
Remove redundant check from String.concat

jemc/ponyc,cquinn/ponyc,Theodus/ponyc,dipinhora/ponyc,CausalityLtd/ponyc,kulibali/ponyc,sgebbie/ponyc,kulibali/ponyc,sgebbie/ponyc,CausalityLtd/ponyc,Theodus/ponyc,dipinhora/ponyc,jemc/ponyc,ponylang/ponyc,kulibali/ponyc,cquinn/ponyc,kulibali/ponyc,ponylang/ponyc,CausalityLtd/ponyc,sgebbie/ponyc,sgebbie/ponyc,Theodus/ponyc,sgebbie/ponyc,ponylang/ponyc,Theodus/ponyc,jemc/ponyc,Theodus/ponyc,dipinhora/ponyc,cquinn/ponyc,cquinn/ponyc