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/ServiceCallExtensions.cs

@@ -0,0 +1,23 @@
+namespace HomeApi.Extensions;
+
+public static class ServiceCallExtensions
+{
+    public static async Task<TResult?> TryCallAsync<TService, TResult>(
+        this TService service,
+        Func<TService, Task<TResult>> action,
+        ILogger logger,
+        string errorMessage)
+        where TResult : class?
+    {
+        try
+        {
+            return await action(service);
+        }
+        catch (OperationCanceledException) { throw; }
+        catch (Exception exception)
+        {
+            logger.LogError(exception, errorMessage);
+            return null;
+        }
+    }
+}