Setting NuGetPackageId for UnpkgProvider and filtering null NuGetPackageId's from install steps. (#154)

Author: raquelsa

src/LibraryManager.Vsix/Commands/RestoreOnBuildCommand.cs

@@ -101,7 +101,10 @@ private async Task ExecuteAsync(object sender, EventArgs e)
             try
             {
                 var dependencies = Dependencies.FromConfigFile(projectItem.FileNames[1]);
-                IEnumerable<string> packageIds = dependencies.Providers.Select(p => p.NuGetPackageId).Distinct();
+                IEnumerable<string> packageIds = dependencies.Providers
+                                                             .Where(p => p.NuGetPackageId != null)
+                                                             .Select(p => p.NuGetPackageId)
+                                                             .Distinct();
 
                 if (!_isPackageInstalled)
                 {

src/LibraryManager/Providers/Unpkg/UnpkgProvider.cs

@@ -22,7 +22,7 @@ public UnpkgProvider(IHostInteraction hostInteraction)
 
         public string Id => IdText;
 
-        public string NuGetPackageId => null;
+        public string NuGetPackageId { get; } = "Microsoft.Web.LibraryManager.Build";
 
         public IHostInteraction HostInteraction { get; }