NuGetReferenceSwitcher throws if it encounters a new style PackageReference in a csproj

[KwalityKoder]

`<ItemGroup> <PackageReference Include="Newtonsoft.Json" Version="8.0.3" />

causes any other Nuget Refs to be skipped in a project due to throwing an exception.

---

Fix (which worked for me) is to add an extra line of code to ensure vsReference.Path is not null or empty before checking to see if its value contains /packages.

    private void LoadReferences()
    {
        References = new ExtendedObservableCollection<ReferenceModel>();
        NuGetReferences = new ExtendedObservableCollection<ReferenceModel>();

        foreach (var vsReference in _vsProject.References.OfType<Reference>())
        {
            var reference = new ReferenceModel(vsReference);
            References.Add(reference);

            if (!string.IsNullOrWhiteSpace(vsReference.Path))       // fix
            {
                if (vsReference.Path.ToLower().Contains("/packages/") || vsReference.Path.ToLower().Contains("\\packages\\"))
                    NuGetReferences.Add(reference);
            }
        }
    }