Do not show sub menu if it only has 1 menu item.
Do not show sub menu if it only has 1 menu item.

campersau/NuGetPackageExplorer,dsplaisted/NuGetPackageExplorer,NuGetPackageExplorer/NuGetPackageExplorer,BreeeZe/NuGetPackageExplorer,NuGetPackageExplorer/NuGetPackageExplorer