undo changes in adv2v2

Author: lantoli

internal/convert/testdata/adv2v2/errors.json

@@ -1,6 +1,7 @@
 {
 	"configuration_file_error": "failed to parse Terraform config file",
 	"replication_specs_missing_region_configs": "replication_specs must have at least one region_configs",
+	"missing_replication_specs": "must have at least one replication_specs",
 	"dynamic_unsupported_tag": "dynamic blocks are not supported for advanced_configuration",
 	"dynamic_regions_config_invalid_multiple_blocks": "dynamic block must be the only block",
 	"dynamic_replication_specs_invalid_multiple_blocks": "dynamic block must be the only block",

internal/convert/testdata/adv2v2/missing_replication_specs.in.tf

@@ -0,0 +1,6 @@
+resource "mongodbatlas_advanced_cluster" "no_replication_specs" {
+  # missing replication_specs
+  project_id   = var.project_id
+  name         = "cluster-multi-region"
+  cluster_type = "REPLICASET"
+}