The package nml has the following automatic provide:

  python3dist(nml) = 0

It appears that the actual package version was lost during the packaging process. 

In most cases, this is caused by using a Source that misses version information, e.g. A GitHub tarball when the project uses setuptools_scm or pbr. See https://docs.fedoraproject.org/en-US/packaging-guidelines/Python/#_source_files_from_pypi

This bugzilla was created in a batch, so it does not have information about the exact cause for this package. If you need help figuring out why this happens in this particular package, feel free to ask.