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-subtle-zero-length.js

@@ -6,6 +6,7 @@ if (!common.hasCrypto)
   common.skip('missing crypto');
 
 const assert = require('assert');
+const { inspect } = require('util');
 const { subtle } = globalThis.crypto;
 
 (async () => {
@@ -17,6 +18,18 @@ const { subtle } = globalThis.crypto;
     [ 'encrypt', 'decrypt' ]);
   assert(k instanceof CryptoKey);
 
+  // Inspecting the prototype should work.
+  const inspected = inspect(Object.getPrototypeOf(k));
+  assert.strictEqual(
+    inspected,
+    'CryptoKey {\n' +
+    '  type: undefined,\n' +
+    '  extractable: undefined,\n' +
+    '  algorithm: undefined,\n' +
+    '  usages: undefined\n' +
+    '}'
+  );
+
   const e = await subtle.encrypt({
     name: 'AES-GCM',
     iv: new Uint8Array(12),