survive missing node values

Author: i-make-robots

src/main/java/com/marginallyclever/nodegraphcore/Graph.java

@@ -378,6 +378,11 @@ public void updateBounds() {
 
     public void fromJSON(JSONObject jo) throws JSONException {
         clear();
+        // older files might be missing these values.
+        if(!jo.has("name")) jo.put("name",getName());
+        if(!jo.has("uniqueID")) jo.put("uniqueID",getUniqueID());
+        if(!jo.has("label")) jo.put("label", getLabel());
+        // proceed now that missing values are added.
         super.fromJSON(jo);
         parseAllNodesFromJSON(jo.getJSONArray("nodes"));
         parseAllConnectionsFromJSON(jo.getJSONArray("connections"));