Fixed react anim on trample attack while fainted (#478)

* TrampleAction now inflicts damage to characters through DamageReceiver
* Damage receiver now checks if it is damageable before invoking its damageReceived event

Author: LPLafontaineB

Assets/BossRoom/Scripts/Server/Game/Action/TrampleAction.cs

@@ -161,7 +161,11 @@ private void CollideWithVictim(ServerCharacter victim)
                 {
                     damage = Description.SplashDamage;
                 }
-                victim.ReceiveHP(m_Parent, -damage);
+
+                if (victim.gameObject.TryGetComponent(out IDamageable damageable))
+                {
+                    damageable.ReceiveHP(m_Parent, -damage);
+                }
             }
 
             var victimMovement = victim.Movement;

Assets/BossRoom/Scripts/Server/Game/Character/ServerCharacter.cs

@@ -178,7 +178,7 @@ IEnumerator KilledDestroyProcess()
         /// </summary>
         /// <param name="inflicter">Person dishing out this damage/healing. Can be null. </param>
         /// <param name="HP">The HP to receive. Positive value is healing. Negative is damage.  </param>
-        public void ReceiveHP(ServerCharacter inflicter, int HP)
+        void ReceiveHP(ServerCharacter inflicter, int HP)
         {
             //to our own effects, and modify the damage or healing as appropriate. But in this game, we just take it straight.
             if (HP > 0)

Assets/BossRoom/Scripts/Server/Game/Entity/DamageReceiver.cs

@@ -15,7 +15,10 @@ public class DamageReceiver : NetworkBehaviour, IDamageable
 
         public void ReceiveHP(ServerCharacter inflicter, int HP)
         {
-            damageReceived?.Invoke(inflicter, HP);
+            if (IsDamageable())
+            {
+                damageReceived?.Invoke(inflicter, HP);
+            }
         }
 
         public IDamageable.SpecialDamageFlags GetSpecialDamageFlags()