Remove superfluous throwIfUnchecked() call

Change-Id: Ie1cd4cdad94331e8f3bee07a7cb8d17b6db4261e
diff --git a/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/TransactionalMapParticipant.java b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/TransactionalMapParticipant.java
index 8837b49..3cb87a4 100644
--- a/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/TransactionalMapParticipant.java
+++ b/core/store/primitives/src/main/java/org/onosproject/store/primitives/impl/TransactionalMapParticipant.java
@@ -18,7 +18,6 @@
 
 import com.google.common.base.MoreObjects;
 import com.google.common.base.Objects;
-import com.google.common.base.Throwables;
 import com.google.common.collect.Maps;
 import com.google.common.collect.Sets;
 import org.onosproject.store.primitives.MapUpdate;
@@ -87,7 +86,6 @@
                     } catch (TimeoutException e) {
                         throw new TransactionException.Timeout();
                     } catch (ExecutionException e) {
-                        Throwables.throwIfUnchecked(e);
                         throw new TransactionException(e.getCause());
                     }
                 }