Description of problem:
On Fedora Rawhide, the nginx module does not have the default stream set. Because there are multiple streams available for this module, DNF will not install using `dnf module install nginx`. It will report an error instead. Since modules should be able to install using the aforementioned command, I consider this a bug.
Steps to reproduce:
1. dnf module list nginx
Modules should have the defaults set.
If you did not set the defaults on purpose, please share the reason and confirm that explicitely.
Default streams are no longer required. I am closing the bug.