NPE in Transition#getTargetStateId()

When you try to get the TargetStateId with getTargetStateId() and no target has been specified a NPE occurs, when the toString() method is called. A simple bugfix:

Index: spring-webflow/src/main/java/org/springframework/webflow/engine/Transition.java
===================================================================
— spring-webflow/src/main/java/org/springframework/webflow/engine/Transition.java (revision 12431)
+++ spring-webflow/src/main/java/org/springframework/webflow/engine/Transition.java (working copy)
@@ -115,6 +115,9 @@
}

public String getTargetStateId() {
+ if (targetStateResolver == null)

{ + return null; + }

return targetStateResolver.toString();
}