Fix example how plugins can react on changes in project config

The example didn't handle the case that on project creation a zero
ObjectId is provided as old ObjectId.

RefNames.REFS_CONFIG has to be used instead of
GitRepositoryManager.REF_CONFIG which doesn't exist anymore.

Change-Id: Ic42ca72a126b70ff0b452e5150e2d1e3c916c73c
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
1 file changed