Error binding solution when checking if a project contains JS/TS files

[duncanp-sonar]

Description

A null-ref exception occurs during binding, preventing the binding operation from succeeding.

Source: this community forum thread.

Error logs

Note: these error logs were produced using a special build of SLVS, with the kind assistance of the user who reported the issue.

Log 1

SonarLint.VisualStudio.Integration.ErrorListInfoBarController: Unexpected error: System.NullReferenceException: Object reference not set to an instance of an object.
   at SonarLint.VisualStudio.Integration.Binding.JsTsProjectTypeIndicator.HasJsTsFileInProject(ProjectItems projectItems)
   at SonarLint.VisualStudio.Integration.Binding.JsTsProjectTypeIndicator.IsJsTs(Project dteProject)
   at SonarLint.VisualStudio.Integration.ProjectToLanguageMapper.GetLanguagesInProject(Project dteProject)
   at SonarLint.VisualStudio.Integration.ProjectToLanguageMapper.GetAllBindingLanguagesForProject(Project dteProject)
   at SonarLint.VisualStudio.Integration.ProjectToLanguageMapper.HasSupportedLanguage(Project project)
   at SonarLint.VisualStudio.Integration.ProjectSystemHelper.<GetSolutionProjects>d__15.MoveNext()
   at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext()
   at System.Linq.Buffer`1..ctor(IEnumerable`1 source)
   at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)
   at SonarLint.VisualStudio.Integration.UnboundProjectFinder.<>c__DisplayClass10_0.<GetFilteredSolutionProjectsAsync>b__0()

Log 2
This same problem also affects the telemetry manager:

DEBUG: [CFamilyTelemetryManager] Failed to calculate cfamily project types: System.NullReferenceException: Object reference not set to an instance of an object.
   at SonarLint.VisualStudio.Integration.Binding.JsTsProjectTypeIndicator.HasJsTsFileInProject(ProjectItems projectItems)
   at SonarLint.VisualStudio.Integration.Binding.JsTsProjectTypeIndicator.IsJsTs(Project dteProject)
   at SonarLint.VisualStudio.Integration.ProjectToLanguageMapper.GetLanguagesInProject(Project dteProject)
   at SonarLint.VisualStudio.Integration.ProjectToLanguageMapper.GetAllBindingLanguagesForProject(Project dteProject)
   at SonarLint.VisualStudio.Integration.ProjectToLanguageMapper.HasSupportedLanguage(Project project)
   at SonarLint.VisualStudio.Integration.ProjectSystemHelper.<GetSolutionProjects>d__15.MoveNext()
   at SonarLint.VisualStudio.Integration.Vsix.CFamily.VcxProject.VcxProjectTypeIndicator.GetProjectTypes()
   at SonarLint.VisualStudio.Integration.Telemetry.CFamilyTelemetryManager.CollectVcxUsage()
   at SonarLint.VisualStudio.Integration.Telemetry.CFamilyTelemetryManager.UpdateTelemetry()