Run features with None values

[sush1q]

Hello!
I am generating report with one decorator, which combines some functions to configure allure report.
So sometimes i need to generate report with None values, for example there is no issues on needed testcase, and i am running function like this:

allure.issue(None)
allure.story(None)

It badly influence on generated report. If it is in story, it makes new group with text: component.tree.unknown and if it is issue it make link to localhost/None

How can i pass None values into this funcs not to corrupt reports