Fix logic

Author: tvon

modules/service/main.tf

@@ -11,7 +11,7 @@ data "aws_caller_identity" "current" {
 locals {
   account_id = try(data.aws_caller_identity.current[0].account_id, "")
   partition  = try(data.aws_partition.current[0].partition, "")
-  region     = try(var.region, try(data.aws_region.current[0].region, ""))
+  region     = var.region != null ? var.region : try(data.aws_region.current[0].region, "")
 }
 
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