fix broken links

MediaBrowser.WebDashboard/MediaBrowser.WebDashboard.csproj

@@ -744,6 +744,7 @@
   <ItemGroup>
     <None Include="packages.config" />
   </ItemGroup>
+  <ItemGroup />
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <PropertyGroup>
     <PostBuildEvent>