PLT-609 - Fix output (#13)

* return the first element or empty string

output.tf

@@ -1,6 +1,6 @@
 output "api_client" {
   description = "created api client through terraform"
-  value       = commercetools_api_client.protected
+  value       = element(coalescelist(commercetools_api_client.protected, [""]), 0)
   sensitive   = true
 }