Lack of interest Version string for fileless submissions

[Floren]

Please add the version string as optional into fileless submissions. I purchased the resources to use it as RPM repository, which do not have a file to attach or url but rather this format:

yum --enablerepo=axivo install openssl

I think the easiest way to fix this is to make the version_string field optional, if the user does not fill it, it will not display. If it does, it will. The version history is great, it should also be available for fileless submissions.