UI fix KVv2 in json editor when value is null

changelog/27094.txt

@@ -0,0 +1,3 @@
+```release-note:bug
+ui: Fix KVv2 json editor to allow null values.
+```

ui/lib/core/addon/utils/advanced-secret.js

@@ -30,6 +30,11 @@ export function obfuscateData(obj) {
   for (const key of Object.keys(obj)) {
     if (Array.isArray(obj[key])) {
       newObj[key] = obj[key].map(() => '********');
+    } else if (obj[key] === null) {
+      // unfortunately in javascript typeof null returns object
+      // this is due to a "historical js bug that will never be fixed"
+      // we handle this situation here
+      newObj[key] = '********';
     } else if (typeof obj[key] === 'object') {
       newObj[key] = obfuscateData(obj[key]);
     } else {

ui/tests/unit/utils/advanced-secret-test.js

@@ -108,7 +108,40 @@ module('Unit | Utility | advanced-secret', function () {
         },
       ].forEach((test) => {
         const result = obfuscateData(test.data);
-        assert.deepEqual(result, test.obscured, `obfuscates values of ${test.name}`);
+        assert.deepEqual(result, test.obscured, `obfuscates object values of ${test.name}`);
+      });
+    });
+
+    test('it obfuscates null values', function (assert) {
+      assert.expect(2);
+      [
+        {
+          name: 'null value',
+          data: {
+            one: 'fish',
+            two: 'fish',
+            three: 'fish',
+            blue: null,
+          },
+          obscured: {
+            blue: '********',
+            one: '********',
+            three: '********',
+            two: '********',
+          },
+        },
+        {
+          name: 'null value nested-object',
+          data: {
+            one: { two: null },
+          },
+          obscured: {
+            one: { two: '********' },
+          },
+        },
+      ].forEach((test) => {
+        const result = obfuscateData(test.data);
+        assert.deepEqual(result, test.obscured, `obfuscates null values of ${test.name}`);
       });
     });