Add headbutting open airlocks when you have no hands (#1433)

Content.Server/GameObjects/Components/Doors/ServerDoorComponent.cs

@@ -2,12 +2,16 @@
 using System.Linq;
 using Content.Server.GameObjects.Components.Access;
 using Content.Server.GameObjects.Components.Mobs;
+using Content.Server.Interfaces.GameObjects;
 using Content.Shared.GameObjects.Components.Doors;
 using Content.Shared.GameObjects.Components.Movement;
 using Content.Shared.Interfaces.GameObjects.Components;
 using Robust.Server.GameObjects;
+using Robust.Server.GameObjects.EntitySystems;
+using Robust.Shared.Audio;
 using Robust.Shared.GameObjects;
 using Robust.Shared.GameObjects.Components;
+using Robust.Shared.GameObjects.Systems;
 using Robust.Shared.Interfaces.GameObjects;
 using Robust.Shared.Maths;
 using Robust.Shared.Serialization;
@@ -145,7 +149,14 @@ namespace Content.Server.GameObjects
                 Deny();
                 return;
             }
+
             Open();
+
+            if (user.TryGetComponent(out HandsComponent hands) && hands.Count == 0)
+            {
+                EntitySystem.Get<AudioSystem>().PlayFromEntity("/Audio/Effects/bang.ogg", Owner,
+                    AudioParams.Default.WithVolume(-2));
+            }
         }
 
         public void Open()

Content.Server/GameObjects/Components/GUI/ServerHandsComponent.cs

@@ -55,6 +55,8 @@ namespace Content.Server.GameObjects
         // Mostly arbitrary.
         public const float PickupRange = 2;
 
+        [ViewVariables] public int Count => _orderedHands.Count;
+
         public override void ExposeData(ObjectSerializer serializer)
         {
             base.ExposeData(serializer);