crypto: allow inspecting the prototype of a crypto key

This would fail so far due to accessing a undefined property.

Author: BridgeAR

lib/internal/crypto/keys.js

@@ -762,7 +762,7 @@ class CryptoKey {
   get type() {
     if (!(this instanceof CryptoKey))
       throw new ERR_INVALID_THIS('CryptoKey');
-    return this[kKeyObject].type;
+    return this[kKeyObject]?.type;
   }
 
   get extractable() {

test/parallel/test-crypto-inspect.js

@@ -0,0 +1,20 @@
+const common = require('../common');
+const { subtle } = require('crypto');
+const { strictEqual } = require('assert');
+
+const promise = subtle.importKey('raw', Buffer.from([1,2,3]), {
+  name:'HMAC', hash: 'SHA-256'
+}, true, ['sign','verify']);
+
+promise.then(common.mustCall((key) => {
+  const inspected = inspect(Object.getPrototypeOf(key));
+  strictEqual(
+    inspected,
+    'CryptoKey {\n' +
+    '  type: undefined,\n' +
+    '  extractable: undefined,\n' +
+    '  algorithm: undefined,\n' +
+    '  usages: undefined\n' +
+    '}'
+  );
+}));