roslyn: File Rename has NullReferenceException

From @ardalis on January 16, 2017 23:21

Trying to rename a file and getting a failure with stack trace shown:

Stack trace: System.AggregateException : One or more errors occurred. —> Object reference not set to an instance of an object. at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions) at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout,CancellationToken cancellationToken) at Microsoft.CodeAnalysis.Editor.Implementation.Suggestions.SuggestedAction.InvokeWorker(Func1 getFromDocument,IProgressTracker progressTracker,CancellationToken cancellationToken) at Microsoft.CodeAnalysis.Editor.Implementation.Suggestions.SuggestedAction.<>c__DisplayClass18_0.<InvokeCore>b__0() at Microsoft.CodeAnalysis.Extensions.IExtensionManagerExtensions.PerformAction(IExtensionManager extensionManager,Object extension,Action action) at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject) ---> (Inner Exception #0) System.NullReferenceException : Object reference not set to an instance of an object. at Microsoft.VisualStudio.LanguageServices.Implementation.ProjectSystem.VisualStudioWorkspaceImpl.RemoveDocumentCore(DocumentId documentId,Boolean isAdditionalDocument) at Microsoft.VisualStudio.LanguageServices.Implementation.ProjectSystem.VisualStudioWorkspaceImpl.ApplyDocumentRemoved(DocumentId documentId) at Microsoft.CodeAnalysis.Workspace.ApplyProjectChanges(ProjectChanges projectChanges) at Microsoft.CodeAnalysis.Workspace.TryApplyChanges(Solution newSolution,IProgressTracker progressTracker) at Microsoft.VisualStudio.LanguageServices.Implementation.ProjectSystem.VisualStudioWorkspaceImpl.TryApplyChanges(Solution newSolution,IProgressTracker progressTracker) at Microsoft.CodeAnalysis.CodeActions.RenameDocumentOperation.TryApply(Workspace workspace,IProgressTracker progressTracker,CancellationToken cancellationToken) at Microsoft.CodeAnalysis.Editor.Implementation.CodeActions.CodeActionEditHandlerService.ProcessOperations(Workspace workspace,ImmutableArray1 operations,IProgressTracker progressTracker,CancellationToken cancellationToken) at async Microsoft.CodeAnalysis.Editor.Implementation.CodeActions.CodeActionEditHandlerService.ApplyAsync(<Unknown Parameters>)<—

Copied from original issue: dotnet/roslyn-project-system#1202