Parser fails to throw an error when i provide an invalid asyncapi file

#### Describe the bug
The Parser doesn't throw any error when I provide an invalid asyncapi file but instead returns `undefined`

#### How to Reproduce
Here as you can see Included the `test:hello` which makes the following asyncapi doc invalid
```
asyncapi: 3.0.0
test: hello
info:
title: Account Service
version: 1.0.0
description: This service is in charge of processing user signups
channels:
user/signedup:
address: user/signedup
messages:
subscribe.message:
$ref: '#/components/messages/UserSignedUp'
operations:
user/signedup.subscribe:
action: send
channel:
$ref: '#/channels/user~1signedup'
messages:
- $ref: '#/components/messages/UserSignedUp'
reply:
channel:
$ref: '#/channels/user~1signedup'
messages:
- $ref: '#/components/messages/UserSignedUp'
components:
messages:
UserSignedUp:
payload:
type: object
properties:
displayName:
type: string
description: Name of the user
email:
type: string
format: email
description: Email of the user
```

#### Expected behavior
I expect the Parser to return an error not `undefined`

Start by reproducing the parser call with the AsyncAPI YAML shown, including the invalid top-level test field, and inspect how the result is handled. Trace the parser's validation path to determine why it returns undefined; done means the invalid document consistently produces an error instead.

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