code review comments included

bindings/java/src/org/sleuthkit/datamodel/CarvedFileContainer.java

+/*
+ * Sleuth Kit Data Model
+ *
+ * Copyright 2012-2014 Basis Technology Corp.
+ * Contact: carrier <at> sleuthkit <dot> org
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *	 http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
 package org.sleuthkit.datamodel;
 
 import java.util.List;

bindings/java/src/org/sleuthkit/datamodel/SleuthkitCase.java

@@ -2728,7 +2728,7 @@ public LayoutFile addCarvedFile(String carvedFileName, long carvedFileSize, long
 	 * @throws org.sleuthkit.datamodel.TskCoreException
 	 */
 	public List<LayoutFile> addCarvedFiles(List<CarvedFileContainer> filesToAdd) throws TskCoreException {
-		if (filesToAdd != null) {
+		if (filesToAdd != null && filesToAdd.isEmpty() == false) {
 			CaseDbTransaction localTrans = beginTransaction();
 			CaseDbConnection connection = localTrans.getConnection();
 			acquireExclusiveLock();