[AspireE2E] Clicking on 'Traces' while the GitHub Copilot Chat window is open will cause the following error: fail: Aspire.Hosting.Dashboard.Model.Assistant.AIContextProvider[0] Error while executing subscriptions.

[vmykagapuz]

REGRESSION INFO

1. This issue reproduces in Aspire 9.5.1
2. This issue does not reproduce in Aspire 9.4.2

INSTALL STEPS

1. Clean machine: Win11 x64 24h2 ENU
2. Install VS 18.0.0 Insiders 2
3. Add feed for Aspire 13.0
4. dotnet new install Aspire.ProjectTemplates::13.0.0 preview.1.25508.8 --force`

REPRO STEPS

1. Open VS > Create a new project > Aspire Starter App [.NET 10.0, Aspire version 13.0] > Create
2. Build and F5
3. Open GHCP
4. Click Traces > Open CMD

ACTUAL
An error occurred when clicking on Traces while the GHCP window is open

GHCPIssue1.mp4

Error message:

fail: Aspire.Hosting.Dashboard.Model.Assistant.AIContextProvider[0]
      Error while executing subscriptions.
      System.ArgumentNullException: Value cannot be null. (Parameter 'source')
         at System.Linq.ThrowHelper.ThrowArgumentNullException(ExceptionArgument argument)
         at System.Linq.Enumerable.TryGetSingle[TSource](IEnumerable`1 source, Func`2 predicate, Boolean& found)
         at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source, Func`2 predicate)
         at Aspire.Dashboard.Components.Pages.Traces.<CreateAIContext>b__125_1(IceBreakersBuilder builder, BuildIceBreakersContext context) in /_/src/Aspire.Dashboard/Components/Pages/Traces.razor.cs:line 439
         at Aspire.Dashboard.Model.Assistant.AssistantChatViewModel.PopulatePrompts(AIContext context) in /_/src/Aspire.Dashboard/Model/Assistant/AssistantChatViewModel.cs:line 463
         at Aspire.Dashboard.Model.Assistant.AssistantChatViewModel.<>c__DisplayClass104_0.<<InitializeCoreAsync>b__8>d.MoveNext() in /_/src/Aspire.Dashboard/Model/Assistant/AssistantChatViewModel.cs:line 414
      --- End of stack trace from previous location ---
         at Aspire.Dashboard.Model.Assistant.AIContextProvider.ExecuteSubscriptionsAsync(List`1 subscriptions) in /_/src/Aspire.Dashboard/Model/Assistant/AIContextProvider.cs:line 117

EXPECTED
There should be no error when clicking on Traces

[vmykagapuz]

Verified that this issue is fixed in latest aspire 13.0.0-preview.1.25516.1. Thanks