fixing platform movement after initialization

source/RobotAPI/components/units/RobotUnit/NJointControllers/NJointHolonomicPlatformVelocityControllerWithRamp.cpp

@@ -81,7 +81,9 @@ namespace armarx
             Eigen::Vector3f result;
             if (activationTime > rtGetControlStruct().commandTimestamp)
             {
-                result = ramp.update(activationVelocity, timeSinceLastIteration.toSecondsDouble());
+                // No valid command has been specified. Sane default: come to rest.
+                const Eigen::Vector3f targetVelocity = Eigen::Vector3f::Zero();
+                result = ramp.update(targetVelocity, timeSinceLastIteration.toSecondsDouble());
             }
             else
             {