Raise error if not started but allow method chaining
Raise error if not started but allow method chaining

jjangsangy/python-matlab-bridge,jjangsangy/python-matlab-bridge,arokem/python-matlab-bridge,arokem/python-matlab-bridge,arokem/python-matlab-bridge,jjangsangy/python-matlab-bridge,blink1073/python-matlab-bridge,blink1073/python-matlab-bridge,blink1073/python-matlab-bridge