fix(sample-gen): respect null values in examples (via #4679)

* improvement: re-enable and improve Models jump-to-path

* fix(sample-gen): respect null values in examples

src/core/plugins/samples/fn.js

@@ -29,6 +29,7 @@ export const sampleFromSchema = (schema, config={}) => {
   let { type, example, properties, additionalProperties, items } = objectify(schema)
   let { includeReadOnly, includeWriteOnly } = config
 
+
   if(example !== undefined) {
     return deeplyStripKey(example, "$$ref", (val) => {
       // do a couple of quick sanity tests to ensure the value