added missing virtual destructor

source/RobotAPI/libraries/ArmarXEtherCAT/AbstractSlave.h

@@ -20,7 +20,7 @@ namespace armarx
 
     public:
         AbstractSlave(const armarx::SlaveIdentifier slaveIdentifier, uint16_t slaveNumber);
-
+        virtual ~AbstractSlave(){}
         /**
          * This is called after EtherCAT Bus is PreOp Mode. This is where the PDO Mapping can be configured for the slave.
          */