FIX: clipEnd not called issue when attachment is null (#2662)

Author: mrrobot97

spine-android/spine-android/src/main/java/com/esotericsoftware/spine/android/SkeletonRenderer.java

@@ -112,6 +112,7 @@ public Array<RenderCommand> render (Skeleton skeleton) {
 			short[] indices = null;
 			Attachment attachment = slot.getAttachment();
 			if (attachment == null) {
+				clipper.clipEnd(slot);
 				continue;
 			}