Remote video stream is not coming when user has only audio stream

[volkans80]

I am using latest version of peerjs(1.4.7) and peer-server(0.6.1)
OSs: Windows 10 latest.
Browsers: Chrome latest.

User1 has only audio stream
User2 has audio and video stream

If User2 calls User1 there is not any problem.

If User1 calls User2, User2's video stream not going to User1.
If i check User1's received stream there is only audio stream of User2.

Thanks,

[li6in9muyou]

To reproduce

Use code in my repo li6in9muyou/peerjs-issue-1035. Or view it live at https://li6in9muyou.github.io/peerjs-issue-1035/.

Expected behaviour

No matter what media tracks the caller uses, caller should receive all tracks from the callee after callee answers.

Actual behaviour

When caller has only one track, caller does not receive both tracks from callee.