fix null issues

Author: christiannagel

src/services/live/Codebreaker.Live/Endpoints/StreamingLiveHub.cs

@@ -1,7 +1,5 @@
 using Azure.Messaging.EventHubs.Consumer;
 
-using Microsoft.Extensions.Azure;
-
 using System.Runtime.CompilerServices;
 
 namespace Codebreaker.Live.Endpoints;
@@ -12,11 +10,16 @@ public async IAsyncEnumerable<GameSummary> SubscribeToGameCompletions(string gam
     {
         await foreach (PartitionEvent ev in consumerClient.ReadEventsAsync(cancellationToken))
         {
-            GameSummary gameSummary;
+            GameSummary? gameSummary;
             try
             {
                 logger.ProcessingGameCompletionEvent();
                 gameSummary = ev.Data.EventBody.ToObjectFromJson<GameSummary>();
+                if (gameSummary is null)
+                {
+                    logger.GameSummaryIsNull();
+                    continue;
+                }
             }
             catch (Exception ex)
             {

src/services/ranking/Codebreaker.Ranking/Services/GameSummaryEventProcessor.cs

@@ -15,7 +15,13 @@ public async Task StartProcessingAsync(CancellationToken cancellationToken = def
         {
             logger.LogInformation("Processing event");
 
-            GameSummary summary = args.Data.EventBody.ToObjectFromJson<GameSummary>();
+            GameSummary? summary = args.Data.EventBody.ToObjectFromJson<GameSummary>();
+
+            if (summary is null)
+            {
+                logger.LogWarning("Game summary is empty after deserialization");
+                return;
+            }
 
             logger.LogInformation("Received game completion event for game {gameId}", summary.Id);
             using var context = await factory.CreateDbContextAsync(cancellationToken);