[unity] Fixed SkeletonGraphic Invalid AABB when instantiating in editor with no active attachments via drag and drop. Closes #2486.

spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonGraphic.cs

@@ -540,7 +540,7 @@ namespace Spine.Unity {
 			if (mesh == null) {
 				return false;
 			}
-			if (mesh.vertexCount == 0) {
+			if (mesh.vertexCount == 0 || mesh.bounds.size == Vector3.zero) {
 				this.rectTransform.sizeDelta = new Vector2(50f, 50f);
 				this.rectTransform.pivot = new Vector2(0.5f, 0.5f);
 				return false;
@@ -572,7 +572,7 @@ namespace Spine.Unity {
 				}
 			}
 
-			if (!anyBoundsAdded) {
+			if (!anyBoundsAdded || combinedBounds.size == Vector3.zero) {
 				this.rectTransform.sizeDelta = new Vector2(50f, 50f);
 				this.rectTransform.pivot = new Vector2(0.5f, 0.5f);
 				return false;

spine-unity/Assets/Spine/package.json

@@ -2,7 +2,7 @@
 	"name": "com.esotericsoftware.spine.spine-unity",
 	"displayName": "spine-unity Runtime",
 	"description": "This plugin provides the spine-unity runtime core.",
-	"version": "4.1.38",
+	"version": "4.1.39",
 	"unity": "2018.3",
 	"author": {
 		"name": "Esoteric Software",