FELIX-4771 - Avoid NPE in Attribute#getContent:

- no longer clone the content field, as it is already a local
  clone, and this pattern isn't used in the other parts of the
  API (such as AD);
- added small test case to verify this behaviour.



git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1653464 13f79535-47bb-0310-9956-ffa450edef68
3 files changed