Fix bug in simple workflow (#9)

* Fix bug in simple workflow

* Update workflow_simple.json

Author: jan-janssen

workflow_simple.json

@@ -1,21 +1,15 @@
 {
   "nodes": {
-    "0": "simple_workflow.add_x_and_y_and_z",
-    "1": "simple_workflow.add_x_and_y",
-    "2": "simple_workflow.add_x_and_y",
-    "3": "simple_workflow.add_x_and_y",
-    "4": 1,
-    "5": 2
-  },
+    "0": "simple_workflow.add_x_and_y", 
+    "1": "simple_workflow.add_x_and_y_and_z", 
+    "2": 1, 
+    "3": 2
+  }, 
   "edges": [
-    {"target": 0, "targetHandle": "x", "source": 1, "sourceHandle": "x"},
-    {"target": 1, "targetHandle": "x", "source": 4, "sourceHandle": null},
-    {"target": 1, "targetHandle": "y", "source": 5, "sourceHandle": null},
-    {"target": 0, "targetHandle": "y", "source": 2, "sourceHandle": "y"},
-    {"target": 2, "targetHandle": "x", "source": 4, "sourceHandle": null},
-    {"target": 2, "targetHandle": "y", "source": 5, "sourceHandle": null},
-    {"target": 0, "targetHandle": "z", "source": 3, "sourceHandle": "z"},
-    {"target": 3, "targetHandle": "x", "source": 4, "sourceHandle": null},
-    {"target": 3, "targetHandle": "y", "source": 5, "sourceHandle": null}
+    {"target": 0, "targetHandle": "x", "source": 2, "sourceHandle": null}, 
+    {"target": 0, "targetHandle": "y", "source": 3, "sourceHandle": null}, 
+    {"target": 1, "targetHandle": "x", "source": 0, "sourceHandle": "x"}, 
+    {"target": 1, "targetHandle": "y", "source": 0, "sourceHandle": "y"}, 
+    {"target": 1, "targetHandle": "z", "source": 0, "sourceHandle": "z"}
   ]
-}
+}