Fixed output of placement_group (fixed #104) (#110)

Author: antonbabenko

examples/basic/main.tf

@@ -114,3 +114,15 @@ module "ec2_with_t3_unlimited" {
   associate_public_ip_address = true
 }
 
+# This instance won't be created
+module "ec2_zero" {
+  source = "../../"
+
+  instance_count = 0
+
+  name                   = "example-zero"
+  ami                    = data.aws_ami.amazon_linux.id
+  instance_type          = "c5.large"
+  subnet_id              = tolist(data.aws_subnet_ids.all.ids)[0]
+  vpc_security_group_ids = [module.security_group.this_security_group_id]
+}

outputs.tf

@@ -7,7 +7,7 @@ locals {
   this_primary_network_interface_id = compact(coalescelist(aws_instance.this.*.primary_network_interface_id, aws_instance.this_t2.*.primary_network_interface_id, [""]))
   this_private_dns                  = compact(coalescelist(aws_instance.this.*.private_dns, aws_instance.this_t2.*.private_dns, [""]))
   this_private_ip                   = compact(coalescelist(aws_instance.this.*.private_ip, aws_instance.this_t2.*.private_ip, [""]))
-  this_placement_group              = compact(concat(coalescelist(aws_instance.this.*.placement_group, aws_instance.this_t2.*.placement_group), [""]))
+  this_placement_group              = compact(coalescelist(aws_instance.this.*.placement_group, aws_instance.this_t2.*.placement_group, [""]))
   this_security_groups              = coalescelist(aws_instance.this.*.security_groups, aws_instance.this_t2.*.security_groups, [""])
   this_vpc_security_group_ids       = coalescelist(flatten(aws_instance.this.*.vpc_security_group_ids), flatten(aws_instance.this_t2.*.vpc_security_group_ids), [""])
   this_subnet_id                    = compact(coalescelist(aws_instance.this.*.subnet_id, aws_instance.this_t2.*.subnet_id, [""]))