early termination when no user found

defaults/main.yaml

@@ -2,9 +2,9 @@
 workflows:
 #   - create-user-add-to-vre
 #   - group_deleted
-#   - user-group_created
+   - user-group_created
 #   - user-group-role_created
-   - group_created
+#   - group_created
 #   - invitation-accepted
 #   - user-group_deleted
 #   - user-group-role_deleted

templates/user-group_created.json.j2

@@ -60,6 +60,27 @@
   			"type": "LAMBDA"
 		},
 		{
+                "name": "check_user_existance",
+                "taskReferenceName": "check_user_existance",
+                "inputParameters": {
+                        "user": "${select_user.output.result[0]}"
+                },
+                "type": "DECISION",
+                "caseExpression": "($.user == null ? 'true' : 'false')",
+                "decisionCases": {
+                    "true": [
+                        {
+                            "name" : "terminate",
+                            "taskReferenceName" : "terminate_when_no_user",
+                            "type" : "TERMINATE",
+                            "inputParameters" : {
+                                    "terminationStatus" : "COMPLETED"
+                            }
+                        }
+                    ]
+                }
+        },
+		{
             "name" : "pyrest",
             "taskReferenceName" : "look_up_groups",
             "type" : "SIMPLE",