Resource Bundle Editor allows removing default value set, throwing indexOutOfBoundsException

Steps to reproduce:
1) Create project with Resource Bundle Editor
2) Create a new RBD
3) Add some value sets that start with a capital, save, close reopen
4) Click the red cross to remove a value set
Expected: Default is not an option to remove
Actual: Default can be removed
5) Delete the default
6) Store
Result:
[INFO] [talledLocalContainer] 13.07.2014 12:24:30 ERROR http-bio-8080-exec-11 [DefaultExceptionMapper.internalMap:129] Unexpected error occurred
[INFO] [talledLocalContainer] org.apache.wicket.WicketRuntimeException: Method onRequest of interface org.apache.wicket.behavior.IBehaviorListener targeted a
[INFO] [talledLocalContainer] Caused by: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
[INFO] [talledLocalContainer] at java.util.ArrayList.rangeCheck(ArrayList.java:635)
[INFO] [talledLocalContainer] at java.util.ArrayList.get(ArrayList.java:411)
[INFO] [talledLocalContainer] at org.onehippo.cms7.resourcebundle.dialogs.ValueSetDeleteDialog.<init>(ValueSetDeleteDialog.java:46)