Cleanup warnings: CS0162, CS0618, CS0649 (#6309)

* Cleanup

* Revert TagHandler for now

* Probably deleting it would be better

Robust.Shared/GameObjects/EntityEventBus.Common.cs

@@ -94,10 +94,6 @@ internal sealed partial class EntityEventBus : IEventBus
     /// </summary>
     private sealed class EventData
     {
-        /// <summary>
-        /// <see cref="ComponentEventAttribute"/> set?
-        /// </summary>
-        public bool ComponentEvent;
         public bool IsOrdered;
         public bool OrderingUpToDate;
         public ValueList<BroadcastRegistration> BroadcastRegistrations;

Robust.Shared/GameObjects/EntityManager.cs

@@ -212,8 +212,9 @@ namespace Robust.Shared.GameObjects
                     _sawmill.Error($"Failed to serialize {compName} component of entity prototype {prototype.ID}. Exception: {e.Message}");
 #if !EXCEPTION_TOLERANCE
                     throw;
-#endif
+#else
                     return false;
+#endif
                 }
 
                 if (compMapping.AnyExcept(protoMapping))