Commented Issue: automatic Package restore doesn't work for solution folder [3625]

1. Create new solution
2. Add a solution folder
3. Add a class library project to the solution folder
4. install package to class library
5. delete packages folder
6. build

Actual:
it doesn't restore packages

Expected:
it should restore packages


Comments: I can reproduce in in Nuget 2.7 also, created an issue https://nuget.codeplex.com/workitem/3640 for this.