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

src/core/utils.js

@@ -742,7 +742,7 @@ export const getCommonExtensions = (defObj) => defObj.filter((v, k) => /^pattern
 // `predicate` can be used to discriminate the stripping further,
 // by preserving the key's place in the object based on its value.
 export function deeplyStripKey(input, keyToStrip, predicate = () => true) {
-  if(typeof input !== "object" || Array.isArray(input) || !keyToStrip) {
+  if(typeof input !== "object" || Array.isArray(input) || input === null || !keyToStrip) {
     return input
   }