Listening Hosts are mandatory in Virtual Hosts mode

[exalate-issue-sync]

Describe the bug :

We are not able to have null as a host on our API.

To Reproduce :

Steps to reproduce the behavior:

1. Create an API.
2. Add null as a host and you will be able to get the issue.

Expected behavior :

We should be able to have null host

Desktop :

• Environment: Docker Desktop APIM 3.20.x

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[exalate-issue-sync]

This issue has been fixed in versions 4.0.11, 3.20.22, 4.2.0, 4.1.2