[libgdx] Fixed NPE in AnimationState, javadoc.

spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/AnimationState.java

@@ -712,10 +712,10 @@ public class AnimationState {
 		propertyIDs.clear(2048);
 		for (int i = tracks.size - 1; i >= 0; i--) {
 			TrackEntry entry = tracks.get(i);
-			do {
+			while (entry != null) {
 				computeNotLast(entry);
 				entry = entry.mixingFrom;
-			} while (entry != null);
+			}
 		}
 	}
 

spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Slot.java

@@ -102,8 +102,7 @@ public class Slot {
 		return attachment;
 	}
 
-	/** Sets the slot's attachment and, if the attachment changed, resets {@link #attachmentTime} and clears
-	 * {@link #attachmentVertices}.
+	/** Sets the slot's attachment and, if the attachment changed, resets {@link #attachmentTime} and clears {@link #deform}.
 	 * @param attachment May be null. */
 	public void setAttachment (Attachment attachment) {
 		if (this.attachment == attachment) return;

spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/attachments/VertexAttachment.java

@@ -50,8 +50,8 @@ public class VertexAttachment extends Attachment {
 		super(name);
 	}
 
-	/** Transforms the attachment's local {@link #getVertices()} to world coordinates. If the slot has {@link Slot#getDeform()},
-	 * they are used to deform the vertices.
+	/** Transforms the attachment's local {@link #getVertices()} to world coordinates. If the slot's {@link Slot#getDeform()} is
+	 * not empty, it is used to deform the vertices.
 	 * <p>
 	 * See <a href="http://esotericsoftware.com/spine-runtime-skeletons#World-transforms">World transforms</a> in the Spine
 	 * Runtimes Guide.