rtabmap: don't publish statistics if process returns false. Also, don't return true when the displacement is too small (when the related parameters are set)

git-svn-id: http://rtabmap.googlecode.com/svn/trunk/rtabmap@1981 f169173b-cf89-36c8-b27e-44dbe73f0c83

corelib/src/Rtabmap.cpp

@@ -845,7 +845,7 @@ bool Rtabmap::process(const SensorData & data)
 				{
 					UWARN("Ignoring location %d because the displacement is too small!", signature->id());
 					_memory->deleteLocation(signature->id());
-					return true;
+					return false;
 				}
 			}
 		}