title: Nuget install local package fails when referencing external package has metadata only (no lib)
body: <p>I am trying to build a local package with Nuget.  My library uses several installed packages including "Microsoft.AspNet.WebApi.OwinSelfHost".  The OwinSelfHost package only has a .nupkg file and not a corresponding lib or content folders.  Nuget fails trying to find the .lib files that does not exist for that package.  Here is the call and the output:
  nuget.exe install NCR.AS.MGC.ClientProxies -Source C:\Sandbox\MGC\Mgc.ClientProxies\bin\Debug -OutputDirectory C:\Sandbox\MGC\packages.out -ExcludeVersion -NoCache</p>
  
  <p>Unable to resolve dependency 'Microsoft.AspNet.WebApi.OwinSelfHost'. Source(s) used: 'nuget.org', 'NugetServer'.
  Feeds used:   C:\Sandbox\MGC\Mgc.ClientProxies\bin\Debug  Attempting to gather dependencies information for package 'NCR.AS.MGC.ClientProxies.1.0.0' with respect to project 'C:\Sandbox\MGC\packages.out', targeting 'Any,Version=v0.0' Attempting to resolve dependencies for package 'NCR.AS.MGC.ClientProxies.1.0.0' with DependencyBehavior 'Lowest'</p>
  
  <p>Any suggestions on creating the local package?</p>