InMemoryRepository: Abort BatchRefUpdate if a command previously failed

If any command has already been marked as failing, fail the entire batch.

Change-Id: I1692240841aa4f4cb252bdccbc6f11d9246929c1

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/dfs/InMemoryRepository.java

@@ -310,6 +310,11 @@ public class InMemoryRepository extends DfsRepository {
 			Map<ObjectId, ObjectId> peeled = new HashMap<>();
 			try (RevWalk rw = new RevWalk(getRepository())) {
 				for (ReceiveCommand c : cmds) {
+					if (c.getResult() != ReceiveCommand.Result.NOT_ATTEMPTED) {
+						reject(cmds);
+						return;
+					}
+
 					if (!ObjectId.zeroId().equals(c.getNewId())) {
 						try {
 							RevObject o = rw.parseAny(c.getNewId());