Use default package icon as og:image when package has no icon
Use default package icon as og:image when package has no icon

skbkontur/NuGetGallery,skbkontur/NuGetGallery,ScottShingler/NuGetGallery,ScottShingler/NuGetGallery,KuduApps/NuGetGallery,projectkudu/SiteExtensionGallery,JetBrains/ReSharperGallery,KuduApps/NuGetGallery,KuduApps/NuGetGallery,KuduApps/NuGetGallery,skbkontur/NuGetGallery,projectkudu/SiteExtensionGallery,JetBrains/ReSharperGallery,ScottShingler/NuGetGallery,mtian/SiteExtensionGallery,KuduApps/NuGetGallery,mtian/SiteExtensionGallery,projectkudu/SiteExtensionGallery,grenade/NuGetGallery_download-count-patch,JetBrains/ReSharperGallery,grenade/NuGetGallery_download-count-patch,grenade/NuGetGallery_download-count-patch,mtian/SiteExtensionGallery