Ev3 dev programs crash when no motor is connected, but used

[VinArt]

Describe the bug

• If a block is used that uses motors, like drive or encoder sensor and if a motor is physically not connected to the port, the program crashes with no error messages.

To Reproduce Steps to reproduce the behavior:

1. Go to ev3dev plugin
2. Use motor blocks without connecting the physically to port
3. Observe (no?) error
4. Repeat with connected motor and see no error

Expected behavior

• Some error message would be show on the screen