User can disable speed override via Python API

[martiniil]

Commit

831fce5c230a07c54e7db9f770adc8f436e1d533

Steps to reproduce

Start real robot. Switch into operation mode T1. Command a movement (e.g. PTP) through the Python API. Choose velocity scale 10.

Expected behavior

No movement should be executed. An error message should be displayed, like e.g. "Invalid velocity scale"

Observed behavior

(Still to be validated with the real robot) In operation mode T1 a speed override of 0.1 leads to a final scaling of 10*0.1=1. Subsequently, a movement with scaling 1 is executed.

[agutenkunst]

imho velocity scale > 1 should not be allowed

The value is given in percentage of the maximal velocity of an axis and has to be in range: (0,1].

See http://docs.ros.org/melodic/api/pilz_robot_programming/html/#move