Prevent additional errors on startup/shutdown (#6788)

Jellyfin.Server/Program.cs

@@ -223,6 +223,9 @@ namespace Jellyfin.Server
                 _logger.LogCritical(ex, "Error while starting server.");
             }
             finally
+            {
+                // Don't throw additional exception if startup failed.
+                if (appHost.ServiceProvider != null)
                 {
                     _logger.LogInformation("Running query planner optimizations in the database... This might take a while");
                     // Run before disposing the application
@@ -231,6 +234,7 @@ namespace Jellyfin.Server
                     {
                         context.Database.ExecuteSqlRaw("PRAGMA optimize");
                     }
+                }
 
                 appHost.Dispose();
             }