NOOP fetches are to be considered succeded

When the FetchOne does not fetch any remote, the
succeeded flag was never processed, therefore the
replication was considered failed, even though it
did not raise any exception.

Change-Id: Ida29ec037db4a85311d5910b68dc990731a229dc

src/main/java/com/googlesource/gerrit/plugins/replication/pull/FetchOne.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/FetchOne.java b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/FetchOne.java
index 5cd208f..e75c4c3 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/pull/FetchOne.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/pull/FetchOne.java
@@ -624,6 +624,11 @@
     boolean anyRefFailed = false;
     RefUpdate.Result lastRefUpdateResult = RefUpdate.Result.NO_CHANGE;
 
+    // NOOP fetches are considered as successes
+    if (refUpdates.isEmpty()) {
+      succeeded = true;
+    }
+
     for (RefUpdateState u : refUpdates) {
       ReplicationState.RefFetchResult fetchStatus = ReplicationState.RefFetchResult.SUCCEEDED;
       Set<ReplicationState> logStates = new HashSet<>();