modules dependencies always return a dependencies.yml content even if the module doesn't exist

[xael-fry]

GET         /modules/repo/:name/:version/dependencies.yml            controllers.Modules.dependencies(name, version)

and in modules.scala

In     modulesLookup.findDependencies(name, version) match {
      case Some(yml) => Ok(yml)
      case None => Ok("self: play -> " + name + " " + version)
    }

So we will always have some content even if the module doesn't exist.
ex
https://www.playframework.com/modules/repo/starwars/1.5/dependencies.yml