vsfeedback: nuget manager ui for solution crashes when you select all projects

[rrelyea]

vs feedback issue: 732919 (talk to rob about how to access) == also 732432

nuget manager crashes vs2017rc1

1. open solution
2. tools -> nuget package manager -> manage nuget packages for solution...
3. select package
4. click project checkbox to select all projects
   -crashes-

I'll attach a recording...

[zhili1208]

from the dump file, I get the repro, following is repro step:

1. open solution
2. install newtonsoft.json
3. disable all available package sources, and create an unavailable source like https://test.
   only enable this source.
4. open NuGet solution UI.
5. select newtonsoft.json
6. click project checkbox to select all projects.

crashes.

the issue is from here https://github.com/NuGet/NuGet.Client/blob/4cccb13833ad29d6a0bcff055460d964f1b49cfe/src/NuGet.Clients/PackageManagement.UI/Models/PackageSolutionDetailControlModel.cs#L134

if source is bad, server will return null for package versions, the UI throws null ref exception in this case