Sonar fixes

Rule: Use isEmpty() to check whether the collection is empty or not.

Change-Id: Ib5ab56b2263623b297db56c5cac2c2ee80e12725
diff --git a/core/api/src/main/java/org/onosproject/net/driver/DefaultDriver.java b/core/api/src/main/java/org/onosproject/net/driver/DefaultDriver.java
index c54ca46..7ed674b 100644
--- a/core/api/src/main/java/org/onosproject/net/driver/DefaultDriver.java
+++ b/core/api/src/main/java/org/onosproject/net/driver/DefaultDriver.java
@@ -99,7 +99,7 @@
                 }
             }));
         }
-        return new DefaultDriver(name, completeParents.size() > 0 ? completeParents : other.parents(),
+        return new DefaultDriver(name, !completeParents.isEmpty() ? completeParents : other.parents(),
                                  manufacturer, hwVersion, swVersion,
                                  ImmutableMap.copyOf(behaviours), properties.build());
     }