fix: crash on unavailable source api (#4)

* fix: crash on unavailable source api

the screen not updating because of errors

* Change temperature format if null

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

HomeApi/Extensions/MediatorExtensions.cs

@@ -0,0 +1,22 @@
+using MediatR;
+
+namespace HomeApi.Extensions;
+
+public static class MediatorExtensions
+{
+    public static async Task<T?> TrySendAsync<T>(
+        this IMediator mediator,
+        IRequest<T> request,
+        CancellationToken cancellationToken) where T : class
+    {
+        try
+        {
+            return await mediator.Send(request, cancellationToken);
+        }
+        catch (OperationCanceledException) { throw; }
+        catch
+        {
+            return null;
+        }
+    }
+}