(FR): DeviceBase: adding hasError method

source/RobotAPI/components/units/RobotUnit/Devices/DeviceBase.h

@@ -45,6 +45,8 @@ namespace armarx
         /// @return Whether the device has the given tag
         bool hasTag(const std::string& tag) const;
 
+        virtual bool hasError(){return false;}
+
     protected:
         /// @brief adds the given tag to the Device
         void addDeviceTag(const std::string& tag);