Null Dereference when Using Interactive Window Before Main NodeJs Package is loaded

[mjbvz]

Repo

1. Launch VS (restored state should have Node.js interactive window open already)
2. Quickly type something into the interactive window
3. Press enter.

Expected
Repl stuff

Actual
Null deref in GetStartupProject:

>   Microsoft.NodejsTools.dll!Microsoft.VisualStudioTools.CommonPackage.GetStartupProject(System.IServiceProvider serviceProvider) Line 178 C#
    Microsoft.NodejsTools.dll!Microsoft.NodejsTools.Repl.VsNodejsReplSite.GetStartupProject() Line 26   C#
    Microsoft.NodejsTools.dll!Microsoft.NodejsTools.Repl.NodejsReplEvaluator.GetNodeExePath() Line 228  C#
    Microsoft.NodejsTools.dll!Microsoft.NodejsTools.Repl.NodejsReplEvaluator.Connect() Line 180 C#
    Microsoft.NodejsTools.dll!Microsoft.NodejsTools.Repl.NodejsReplEvaluator.EnsureConnected() Line 169 C#
    Microsoft.NodejsTools.dll!Microsoft.NodejsTools.Repl.NodejsReplEvaluator.ExecuteText(string text) Line 135  C#
    Microsoft.NodejsTools.InteractiveWindow.dll!Microsoft.NodejsTools.Repl.ReplWindow.ExecuteActiveCode.AnonymousMethod__196_0() Line 2330  C#
    Microsoft.NodejsTools.InteractiveWindow.dll!Microsoft.NodejsTools.Repl.ReplWindow.UIThread(System.Action action) Line 3272  C#
    Microsoft.NodejsTools.InteractiveWindow.dll!Microsoft.NodejsTools.Repl.ReplWindow.ExecuteActiveCode() Line 2299 C#
    Microsoft.NodejsTools.InteractiveWindow.dll!Microsoft.NodejsTools.Repl.ReplWindow.Submit() Line 1943    C#
    Microsoft.NodejsTools.InteractiveWindow.dll!Microsoft.NodejsTools.Repl.ReplWindow.PreEditorCommandFilterExec(ref System.Guid pguidCmdGroup, uint nCmdID, uint nCmdexecopt, System.IntPtr pvaIn, System.IntPtr pvaOut) Line 1567 C#
    Microsoft.NodejsTools.InteractiveWindow.dll!Microsoft.NodejsTools.Repl.ReplWindow.CommandFilter.Exec(ref System.Guid pguidCmdGroup, uint nCmdID, uint nCmdexecopt, System.IntPtr pvaIn, System.IntPtr pvaOut) Line 1344 C#

The root cause is that NodejsPackage.Instance is null at this point.

This crashes the interactive window and requires a VS restart.