[js] check for null in haxe.CallStack.makeStack
[js] check for null in haxe.CallStack.makeStack

pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe,pleclech/hacking-haxe