fix: case when message is oneOf for one element

[Tenischev]

Description

If message object is

      message:
        oneOf:
          - $ref: '#/components/messages/ixOtaResponse'

Then parser will return

channel.subscribe().hasMultipleMessages() => false
channel.subscribe().messages() => [ Message{ ... } ]
channel.subscribe().message() => Message{ ... }

Related issue(s)
Fixes #475

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[derberg]

LGTM

anything from you @magicmatatjahu ? as I saw you commenting on the issue

[magicmatatjahu]

actually, that logic bites me a little bit, because if someone passes message(2), it should return null, but because of the lines

if (!this._json.message.oneOf) return new Message(this._json.message);

I accept this solution because this function has bad logic from the beginning anyway.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[magicmatatjahu]

/rtm

[asyncapi-bot]

🎉 This PR is included in version 1.15.1 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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[asyncapi-bot]

🎉 This PR is included in version 2.0.0-next-major.18 🎉

The release is available on:

• npm package (@next-major dist-tag)
• GitHub release

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