Link annotation doesn't work correctly without parameter allure.link.custom.pattern #480

I'm submitting a ...

• bug report

What is the current behavior?

Allure Docs describe us how to use @Link annotation by this example:

@Link("https://example.org")

And later in the docs there is an example of using link patterns with allure.properties file:

allure.link.mylink.pattern=https://example.org/mylink/{}
allure.link.issue.pattern=https://example.org/issue/{}
allure.link.tms.pattern=https://example.org/tms/{}

But these examples only for @Issues and @TmsLink annotations.
So this annotation generates results *.json file like this: "links":[{"name":"https://docs.qameta.io","type":"custom"}]
This link has no URL in Allure Report (see demo report)

But then we set allure.link.custom.pattern property in allure.properties file - Link works!

allure.link.custom.pattern={}

This pattern looks useless, but without it, links don't work

If the current behavior is a bug, please provide the steps to reproduce and if possible a minimal demo of the problem

The demo project is in allure-examples, and also there is demo report

What is the expected behavior?

@Link("https://example.org") annotation with one parameter should work without system property, like link("http://ya.ru") lambda method.
This should generate a link with the same name and URL. Results *.json file should contains

"links":[{"name":"https://example.org","url":"https://example.org","type":"custom"}

Please tell us about your environment:

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