[unity] Cleanup BoundingBoxFollower support for active skin.

spine-unity/Assets/Examples/Other Examples/Mix and Match.unity

@@ -1299,3 +1299,65 @@ SpriteRenderer:
   m_AdaptiveModeThreshold: 0.5
   m_SpriteTileMode: 0
   m_WasSpriteAssigned: 1
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+--- !u!114 &2010453061
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+  m_InputActionsPerSecond: 10
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spine-unity/Assets/Examples/Scripts/MixAndMatch.cs

@@ -54,6 +54,7 @@ namespace Spine.Unity.Examples {
 
 		[Header("Runtime Repack")]
 		public bool repack = true;
+		public BoundingBoxFollower bbFollower;
 
 		[Header("Do not assign")]
 		public Texture2D runtimeAtlas;
@@ -122,6 +123,7 @@ namespace Spine.Unity.Examples {
 				repackedSkin.Append(customSkin);
 				repackedSkin = repackedSkin.GetRepackedSkin("repacked skin", sourceMaterial, out runtimeMaterial, out runtimeAtlas);
 				skeleton.SetSkin(repackedSkin);
+				if (bbFollower != null) bbFollower.Initialize(true);
 			} else {
 				skeleton.SetSkin(customSkin);
 			}

spine-unity/Assets/spine-unity/Modules/BoundingBoxFollower/BoundingBoxFollower.cs

@@ -115,7 +115,8 @@ namespace Spine.Unity {
 				foreach (var skin in skeleton.Data.Skins)
 					AddSkin(skin, slotIndex);
 
-				AddSkin(skeleton.skin, slotIndex);
+				if (skeleton.skin != null)
+					AddSkin(skeleton.skin, slotIndex);
 			}
 
 			if (BoundingBoxFollower.DebugMessages) {