 added extract exception handling
 added extract exception handling

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