This file exists as a workaround for https://github.com/dotnet/cli/issues/1396
('dotnet publish' does not publish any directories that didn't exist or were
empty before the publish script started, which means it's not enough just to
run 'npm install' during publishing: you need to ensure node_modules already
existed at least).

Hopefully, this can be removed after the move to the new MSBuild.
