Describe the bug

A web project with no static assets static assets files in the output. We shouldn't be generating extra files if there's nothing in the source:

To Reproduce

• Make a new project using the .NET 6.0 rc1 builds
• Look at the bin folder
• Observe both WebApplication519.StaticWebAssets.xml, WebApplication519.staticwebassets.runtime.json, WebApplication519.staticwebassets.json files.

{
  "ContentRoots": [],
  "Root": {
    "Children": null,
    "Asset": null,
    "Patterns": null
  }
}

<StaticWebAssets Version="1.0" />

Further technical details

• Microsoft.AspNetCore.App 6.0.0-rc.1.21406.15