Added Database recorder menu option

git-svn-id: http://rtabmap.googlecode.com/svn/trunk/rtabmap@1433 f169173b-cf89-36c8-b27e-44dbe73f0c83

corelib/src/DBReader.cpp

@@ -127,6 +127,12 @@ void DBReader::mainLoop()
 			{
 				Image data(image, depth, depth2d, depthConstant, pose, localTransform);
 				this->post(new OdometryEvent(data));
+				if(pose.isNull())
+				{
+					UWARN("Reading the database: odometry is null! "
+						  "Please set \"Ignore odometry = true\" if there is "
+						  "no odometry in the database.");
+				}
 			}
 			else
 			{