Enable checkstyle rule to find empty code blocks

Enabled checkstyle rule that detects empty code blocks and fixed the
violations that were discovered.

Change-Id: Icc23e028f2bbabc1849ec566923aa125b2486a3b
diff --git a/src/main/java/net/onrc/onos/core/datastore/hazelcast/HZClient.java b/src/main/java/net/onrc/onos/core/datastore/hazelcast/HZClient.java
index cbe10be..4cc68b4 100644
--- a/src/main/java/net/onrc/onos/core/datastore/hazelcast/HZClient.java
+++ b/src/main/java/net/onrc/onos/core/datastore/hazelcast/HZClient.java
@@ -326,9 +326,7 @@
         }
         for (IMultiEntryOperation op : ops) {
             IModifiableMultiEntryOperation mop = (IModifiableMultiEntryOperation) op;
-            if (mop.hasSucceeded()) {
-                // status update is already done, nothing to do.
-            } else {
+            if (!mop.hasSucceeded()) {
                 failExists = true;
             }
         }