Rename Skeleton.findBoneByName with .getBoneByName

src/animation/PropertyBinding.js

@@ -219,9 +219,9 @@ Object.assign( PropertyBinding, {
 		// search into skeleton bones.
 		if ( root.skeleton ) {
 
-			var bone = root.skeleton.findBoneByName( nodeName );
+			var bone = root.skeleton.getBoneByName( nodeName );
 
-			if ( bone ) {
+			if ( bone !== undefined ) {
 
 				return bone;
 

src/objects/Skeleton.js

@@ -154,7 +154,7 @@ Object.assign( Skeleton.prototype, {
 
 	},
 
-	findBoneByName: function ( name ) {
+	getBoneByName: function ( name ) {
 
 		for ( var i = 0, il = this.bones.length; i < il; i ++ ) {
 
@@ -168,7 +168,7 @@ Object.assign( Skeleton.prototype, {
 
 		}
 
-		return null;
+		return undefined;
 
 	}