ftgpm-edit: don't throw error

src/main/webapp/plugins/cdf/ftgpm-edit.js

@@ -153,7 +153,8 @@ Draw.loadPlugin(function(ui) {
         if (isControlFlowNode(type)) {
           return "ctrl";
         }
-        throw new Error("unknown flow type");
+        // throw new Error("unknown flow type");
+        console.log("unknown flow type");
       }
 
       // [ condition, style ]